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2021 ring makudang versi Kalénder
Kalénder Grégorian	2021; MMXXI
Ab urbe condita	2774
Kalénder Armenia	1470; ԹՎ ՌՆՀ
Kalénder Assyria	6771
Kalénder Bahá'í	177–178
Kalénder Bali saka	1942–1943
Kalénder Bengali	1428
Kalénder Berber	2971
British Regnal year	69 Eliz. 2 – 70 Eliz. 2
Kalénder Budha	2565
Kalénder Burma	1383
Kalénder Byzantium	7529–7530
Kalénder Cina	庚子年 (Logam Bikul); 4717 or 4657; — to —; 辛丑年 (Logam Lembu); 4718 or 4658
Kalénder Koptik	1737–1738
Kalénder Discordian	3187
Kalénder Éthiopia	2013–2014
Kalénder Hebrew	5781–5782
Kalénder Hindu
- Vikram Samvat	2077–2078
- Shaka Samvat	1942–1943
- Kali Yuga	5121–5122
Kalénder Holosén	12021
Kalénder Igbo	1021–1022
Kalénder Iran	1399–1400
Kalénder Islam	1442–1443
Kalénder Jepang	Reiwa 3; (令和３年)
Kalénder Jawa	1954–1955
Kalénder Juche	110
Kalénder Julian	Gregorian minus 13 days
Kalénder Koréa	4354
Kalénder Minguo	ROC 110; 民國110年
Kalénder Nanakshahi	553
Kalénder solar Thai	2564
Kalénder Tibét	阳金鼠年; (Logam lanang-Bikul); 2147 or 1766 or 994; — to —; 阴金牛年; (Logam istri-Lembu); 2148 or 1767 or 995
Unix time	1609459200 – 1640995199

	2021 manut topik:
	Seni
	Arsitektur – Komik – Pilem – Home video – Literatur (Puisi) – Musik (Country, Rock, Metal, UK, US) – Radio – Poto – Televisi (UK, US) – Video gaming
	Politik lan pamréntahan
	Elections – International leaders – Sovereign states; Pemimpin negara berdaulatn – Gubernur teritorial
	Sains lan téknologi
	Arkeologi – Penerbangan – Kedis/Ornitologi – Palaeontologi – Rel transportasi – Penerbangan luar angkasa
	Olahraga
	Football Amérika – Sépakbola – Athletics (sport) – Badminton – Bisbol – Baskét – Chess – Golf – Ice hockey – Ténis – Voli
	Manut genah
	Afghanistan – Albania – Algeria – Andorra – Angola – Antartika – Argentina – Armenia – Australia – Austria – Azerbaijan – Bangladesh – Bahama – Barbados – Belgia – Benin – Bhutan – Bosnia and Herzegovina – Brazil – Bulgaria – Burkina Faso – Burundi – Kamboja – Cameroon – Kanada – Cape Verde – Republik Afrika Tengah – Chad – Chili – Cina – Kolombia – Costa Rica – Kroatia – Kuba – Siprus – Czechia – Denmark – Ekuador – Mesir – El Salvador – Estonia – Ethiopia – Uni Eropa – Finlandia – Prancis – Gabon – Georgia – Jerman – Ghana – Yunani – Guatemala – Guyana – Honduras – Hong Kong – Hungaria – Islandia – India – Indonesia – Iraq – Iran – Ireland – Israel – Italy – Pantai Gading – Japan – Kazakhstan – Kenya – Kosovo – Kuwait – Kyrgyzstan – Laos – Latvia – Lebanon – Libya – Lithuania – Luxembourg – Macau – Madagaskar – Malawi – Malaysia – Mali – Meksiko – Moldova – Montenegro – Maroko – Mozambique – Myanmar – Nepal – Belanda – Selandia Baru – Nicaragua – Niger – Nigeria – North Korea – Norwegia – Oman – Pakistan – Palestine – Peru – Philippines – Poland – Portugal – Romania – Rusia – Rwanda – Saudi Arabia – Senegal – Serbia – Singapore – Slovakia – Slovenia – Somalia – Afrika Selatan – Korea Selatan – South Sudan – Spain – Sri Lanka – Sudan – Sweden – Switzerland – Syria – Taiwan – Tanzania – Thailand – Tunisia – Turkey – Uganda – Ukraine – United Arab Emirates – United Kingdom – United States – Uruguay – Uzbekistan – Venezuela – Vietnam – Yaman – Zambia – Zimbabwe
	Topik liyanan
	Pemimpin religius
	Kategori Embas miwah Seda
	Embas – Seda
	Kategori Adegang miwah Biurang
	Adegang – Biurang
	Kategori Karya lan Pengantar
	Karya – Pengantar; Karya sane masuk domain publik
	c; p; u;

Milenium:	Milenium ka-3
Abad:	Abad ka-20; Abad ka-21; Abad ka-22;
Dasawarsa:	2000-an; 2010-an; 2020-an; 2030-an; 2040-an;
Warsa:	2018; 2019; 2020; 2021; 2022; 2023; 2024;

2021 (MMXXI) inggih punika warsa biasa sané katutug rahina Sukra ring kaléndér Grégorian, warsa ka-2021 ring kaucapang Masehi (M) miwah Anno Domini (AD), warsa ka-21 ring Milenium ka-3 , warsa ka-21 ring Abad ka-21 , miwah warsa ka- 2 ring dékade 2020-an . Denominasi 2021 antuk warsa puniki sampun kaanggén saking periode Abad Pertengahan awal, dugas Era kalender Anno Domini (Warsa Masehi) dados metode kapara ring Éropa antuk pearanan warsa.