21 in Roman Numerals

Roman numeral
21 = XXI
10 + 10 + 1 = X + X + I
The number 21 is written as XXI in Roman numerals, formed by adding X + X + I (10 + 10 + 1).
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Nearby numbers

NumberRoman numeral
10X
19XIX
20XX
21XXI
22XXII
23XXIII
50L
100C
500D
1000M

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Frequently asked questions

What is 21 in Roman numerals?+

21 in Roman numerals is XXI.

How is 21 written in Roman numerals?+

21 breaks down as 10 + 10 + 1 = X + X + I, which is written XXI.