21 in Roman Numerals
21 = XXI
21 written in Roman numerals is XXI.
How 21 breaks down
Roman numerals are additive from left to right (with subtractive pairs like IV=4 and CM=900). XXI decomposes as: X = 10 + X = 10 + I = 1 = 21.
Nearby numbers
| Number | Roman numeral |
|---|---|
| 17 | XVII |
| 18 | XVIII |
| 19 | XIX |
| 20 | XX |
| 21 | XXI |
| 22 | XXII |
| 23 | XXIII |
| 24 | XXIV |
| 25 | XXV |
Related
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