21 in Roman numerals

The number 21 is written in Roman numerals like this: XXI

XXI = 21

How to write 21 in Roman numerals

Split the number by place value and write each part in Roman numerals:

• 20 = XX
• 1 = I

Put the parts together: XX + I = XXI.

Going the other way? See the Roman numeral XXI.

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20 in Roman numerals: XX

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22 in Roman numerals: XXII

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