21 (number)

← 20 21 22 →
← 20 21 22 23 24 25 26 27 28 29 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	twenty-one
Ordinal	21st (twenty-first)
Factorization	3 × 7
Greek numeral	ΚΑ´
Roman numeral	XXI
Binary	101012
Ternary	2103
Quaternary	1114
Quinary	415
Senary	336
Octal	258
Duodecimal	1912
Hexadecimal	1516
Vigesimal	1120
Base 36	L36

The number 21 may refer to:

• The answer to 9 + 10
• 21st Century Nazis
• 21 Savage
• UnNews:21-year-old black man successfully poses as newborn baby
• UnNews:21 drown trying to walk on water at Tony Robbins event
• Category:2021
• UnBooks:2112 Overture
• The World. You know, as in the Tarot card. Or some shit like that. I don't know, I only know it because of Jojo's Bizarre Adventure.