21,331 in words
21,331
twenty-one thousand three hundred thirty-one
21,331 is written twenty-one thousand three hundred thirty-one.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred thirty-first
- Expanded form
- 20,000 + 1,000 + 300 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 83, 257 and 21,331 (4 factors)
- First 10 multiples
- 21,331, 42,662, 63,993, 85,324, 106,655, 127,986, 149,317, 170,648, 191,979, 213,310
- Square
- 21,331 × 21,331 = 455,011,561
- Square root
- ≈ 146.05
- Sum of the digits
- 2 + 1 + 3 + 3 + 1 = 10
- Rounded to the nearest 10
- 21,330
- Rounded to the nearest 100
- 21,300
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,330
- Number after
- 21,332
- In binary
101001101010011
Quick check
What number comes just after 21,331?
Show the answer
21,332
Is 21,331 even or odd?
Show the answer
Odd
What is 21,331 + 10?
Show the answer
21,341
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
Find the missing number in a sequence.Frequently asked questions
How do you write 21,331 in words?
21,331 is written "twenty-one thousand three hundred thirty-one".
Is 21,331 a prime number?
No. 21,331 is a composite number, because it has more than two factors.
What are the factors of 21,331?
The factors of 21,331 are 1, 83, 257 and 21,331.