**21 in Roman Numerals** is XXI. To represent any number in Roman numerals, the 7 primary symbols are used with certain rules. Refer to the rules of Roman numerals. 21 is represented as XXI in the Roman numeral system. XXI follows the addition rule. In the representation XXI, the numerals X is added twice and the resultant is added to I.

Number |
Roman Numeral |

21 |
XXI |

## How to Write 21 in Roman Numerals?

To convert 21 in Roman Numerals, we need to split the number according to the available symbols. i,e I, V, X, L, C, D, and M.

The simple way to split 21 will be 20 + 1. (But there is no letter for 20).

Hence 21 can be represented as 10 + 10 + 1.

21 = 10 + 10 + 1

21 = X + X + I

21 = XXI

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## Frequently Asked Questions on 21 in Roman Numerals

### How to write the number 21 in Roman Numerals?

21 in Roman Numerals is written as XXI.

### Does XXI represent the number 21?

Yes. XXI represents the number 21.

### Does XXIXXI represent the year 2121?

No. XXIXXI does not represent the year 2121.