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
21 in other calendars
Gregorian calendar 21
XXI
Ab urbe condita 774
Armenian calendar N/A
Assyrian calendar 4771
Bahá'í calendar -1823–-1822
Bengali calendar -572
Berber calendar 971
English Regnal year N/A
Buddhist calendar 565
Burmese calendar -617
Byzantine calendar 5529–5530
Chinese calendar 庚辰年十二月廿九日
(2657/2717-12-29)
— to —
辛巳年十二月初九日
(2658/2718-12-9)
Coptic calendar -263–-262
Ethiopian calendar 13–14
Hebrew calendar 3781–3782
Hindu calendars
 - Vikram Samvat 77–78
 - Shaka Samvat N/A
 - Kali Yuga 3122–3123
Holocene calendar 10021
Iranian calendar 601 BP – 600 BP
Islamic calendar 619 BH – 618 BH
Japanese calendar
Korean calendar 2354
Minguo calendar 1891 before ROC
民前1891年
Thai solar calendar 564

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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