21,508 in words
21,508
twenty-one thousand five hundred and eight
21,508 is written twenty-one thousand five hundred and eight.
Ways to write it
- As an ordinal
- twenty-one thousand five hundred and eighth
- Expanded form
- 20,000 + 1,000 + 500 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 5 | 500 |
| tens | 0 | 0 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 19, 38, 76, 283, 566, 1,132, 5,377, 10,754 and 21,508 (12 factors)
- First 10 multiples
- 21,508, 43,016, 64,524, 86,032, 107,540, 129,048, 150,556, 172,064, 193,572, 215,080
- Square
- 21,508 × 21,508 = 462,594,064
- Square root
- ≈ 146.66
- Sum of the digits
- 2 + 1 + 5 + 0 + 8 = 16
- Rounded to the nearest 10
- 21,510
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,507
- Number after
- 21,509
- In binary
101010000000100
Quick check
What number comes just after 21,508?
Show the answer
21,509
Is 21,508 even or odd?
Show the answer
Even
What is 21,508 + 10?
Show the answer
21,518
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 21,508 in words?
21,508 is written "twenty-one thousand five hundred and eight".
Is 21,508 a prime number?
No. 21,508 is a composite number, because it has more than two factors.
What are the factors of 21,508?
The factors of 21,508 are 1, 2, 4, 19, 38, 76, 283, 566, 1,132, 5,377, 10,754 and 21,508.