21,031 in words
21,031
twenty-one thousand thirty-one
21,031 is written twenty-one thousand thirty-one.
Ways to write it
- As an ordinal
- twenty-one thousand thirty-first
- Expanded form
- 20,000 + 1,000 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,031 (2 factors)
- First 10 multiples
- 21,031, 42,062, 63,093, 84,124, 105,155, 126,186, 147,217, 168,248, 189,279, 210,310
- Square
- 21,031 × 21,031 = 442,302,961
- Square root
- ≈ 145.02
- Sum of the digits
- 2 + 1 + 0 + 3 + 1 = 7
- Rounded to the nearest 10
- 21,030
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,030
- Number after
- 21,032
- In binary
101001000100111
Quick check
What number comes just after 21,031?
Show the answer
21,032
Is 21,031 even or odd?
Show the answer
Odd
What is 21,031 + 10?
Show the answer
21,041
Practice 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 21,031 in words?
21,031 is written "twenty-one thousand thirty-one".
Is 21,031 a prime number?
Yes. 21,031 is a prime number: its only factors are 1 and 21,031.
What are the factors of 21,031?
The factors of 21,031 are 1 and 21,031.