21,008 in words
21,008
twenty-one thousand eight
21,008 is written twenty-one thousand eight.
Ways to write it
- As an ordinal
- twenty-one thousand eighth
- Expanded form
- 20,000 + 1,000 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 8, 13, 16, 26, 52, 101, 104, 202, 208, 404, 808, 1,313, 1,616, 2,626, 5,252, 10,504 and 21,008 (20 factors)
- First 10 multiples
- 21,008, 42,016, 63,024, 84,032, 105,040, 126,048, 147,056, 168,064, 189,072, 210,080
- Square
- 21,008 × 21,008 = 441,336,064
- Square root
- ≈ 144.94
- Sum of the digits
- 2 + 1 + 0 + 0 + 8 = 11
- Rounded to the nearest 10
- 21,010
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,007
- Number after
- 21,009
- In binary
101001000010000
Quick check
What number comes just after 21,008?
Show the answer
21,009
Is 21,008 even or odd?
Show the answer
Even
What is 21,008 + 10?
Show the answer
21,018
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 21,008 in words?
21,008 is written "twenty-one thousand eight".
Is 21,008 a prime number?
No. 21,008 is a composite number, because it has more than two factors.
What are the factors of 21,008?
The factors of 21,008 are 1, 2, 4, 8, 13, 16, 26, 52, 101, 104, 202, 208, 404, 808, 1,313, 1,616, 2,626, 5,252, 10,504 and 21,008.