521 in Words
How do you write 521 in words?
The number 521 is written five hundred twenty-one in words. As an ordinal it is five hundred twenty-first, and on a check you would write Five hundred twenty-one and 00/100.
Last updated 24 August 2026
Other ways to write it
| Cardinal | five hundred twenty-one |
|---|---|
| Ordinal | five hundred twenty-first |
| Currency | five hundred twenty-one dollars |
| Check format | Five hundred twenty-one and 00/100 |
How 521 is written
521 is the sum of its place values, 500 + 20 + 1, and is written five hundred twenty-one.
Its ordinal form is five hundred twenty-first — only the final element takes the ordinal ending — and on a check the amount line reads "Five hundred twenty-one and 00/100", where 00/100 stands for zero cents.
British English inserts "and" before the last part, giving five hundred and twenty-one, where American English writes five hundred twenty-one without it.
For house-style rules on spelling out numbers, see the Chicago Manual of Style.
Facts about 521
- 521 is an odd number.
- It is a prime number.
- Digit sum: 8.
- Roman numerals: DXXI.
- Binary: 1000001001.
- Hexadecimal: 209.
| Digit | Place |
|---|---|
| 5 | hundreds |
| 2 | tens |
| 1 | ones |
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Frequently asked questions
How do you write 521 in words?
521 in words is "five hundred twenty-one".
How do you spell 521?
521 is spelled "five hundred twenty-one".
How do you write 521 on a check?
On a check, write "Five hundred twenty-one and 00/100".