21

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Millennium: 1st millennium
Centuries: 1st century BC1st century2nd century
Decades: 0s BC  0s  10s  – 20s –  30s  40s  50s
Years: 18 19 202122 23 24
AD 21 in various calendars
Gregorian calendar AD 21
XXI
Ab urbe condita 774
Assyrian calendar 4771
Balinese saka calendar N/A
Bengali calendar −572
Berber calendar 971
Buddhist calendar 565
Burmese calendar −617
Byzantine calendar 5529–5530
Chinese calendar 庚辰(Metal Dragon)
2717 or 2657
    — to —
辛巳年 (Metal Snake)
2718 or 2658
Coptic calendar −263 – −262
Discordian calendar 1187
Ethiopian calendar 13–14
Hebrew calendar 3781–3782
Hindu calendars
 - Vikram Samvat 77–78
 - Shaka Samvat N/A
 - Kali Yuga 3121–3122
Holocene calendar 10021
Iranian calendar 601 BP – 600 BP
Islamic calendar 619 BH – 618 BH
Javanese calendar N/A
Julian calendar AD 21
XXI
Korean calendar 2354
Minguo calendar 1891 before ROC
民前1891年
Nanakshahi calendar −1447
Seleucid era 332/333 AG
Thai solar calendar 563–564
Tibetan calendar 阳金龙年
(male Iron-Dragon)
147 or −234 or −1006
    — to —
阴金蛇年
(female Iron-Snake)
148 or −233 or −1005

21 is a year in the 1st century. It was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Caesar.

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