521 in words
521
five hundred twenty-one
521 is written five hundred twenty-one.
Ways to write it
- As an ordinal
- five hundred twenty-first
- Roman numeral
- DXXI
- Expanded form
- 500 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 5 | 500 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 521 (2 factors)
- First 10 multiples
- 521, 1,042, 1,563, 2,084, 2,605, 3,126, 3,647, 4,168, 4,689, 5,210
- Square
- 521 × 521 = 271,441
- Square root
- ≈ 22.83
- Sum of the digits
- 5 + 2 + 1 = 8
- Rounded to the nearest 10
- 520
- Rounded to the nearest 100
- 500
- Number before
- 520
- Number after
- 522
- In binary
1000001001
Quick check
What number comes just after 521?
Show the answer
522
Is 521 even or odd?
Show the answer
Odd
What is 521 + 10?
Show the answer
531
Practice with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 521 in words?
521 is written "five hundred twenty-one".
Is 521 a prime number?
Yes. 521 is a prime number: its only factors are 1 and 521.
What are the factors of 521?
The factors of 521 are 1 and 521.
How do you write 521 in Roman numerals?
521 in Roman numerals is DXXI.