21,131 in words
21,131
twenty-one thousand one hundred thirty-one
21,131 is written twenty-one thousand one hundred thirty-one.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred thirty-first
- Expanded form
- 20,000 + 1,000 + 100 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 11, 17, 113, 187, 1,243, 1,921 and 21,131 (8 factors)
- First 10 multiples
- 21,131, 42,262, 63,393, 84,524, 105,655, 126,786, 147,917, 169,048, 190,179, 211,310
- Square
- 21,131 × 21,131 = 446,519,161
- Square root
- ≈ 145.37
- Sum of the digits
- 2 + 1 + 1 + 3 + 1 = 8
- Rounded to the nearest 10
- 21,130
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,130
- Number after
- 21,132
- In binary
101001010001011
Quick check
What number comes just after 21,131?
Show the answer
21,132
Is 21,131 even or odd?
Show the answer
Odd
What is 21,131 + 10?
Show the answer
21,141
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 21,131 in words?
21,131 is written "twenty-one thousand one hundred thirty-one".
Is 21,131 a prime number?
No. 21,131 is a composite number, because it has more than two factors.
What are the factors of 21,131?
The factors of 21,131 are 1, 11, 17, 113, 187, 1,243, 1,921 and 21,131.