21,007 in words
21,007
twenty-one thousand seven
21,007 is written twenty-one thousand seven.
Ways to write it
- As an ordinal
- twenty-one thousand seventh
- Expanded form
- 20,000 + 1,000 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 7, 3,001 and 21,007 (4 factors)
- First 10 multiples
- 21,007, 42,014, 63,021, 84,028, 105,035, 126,042, 147,049, 168,056, 189,063, 210,070
- Square
- 21,007 × 21,007 = 441,294,049
- Square root
- ≈ 144.94
- Sum of the digits
- 2 + 1 + 0 + 0 + 7 = 10
- Rounded to the nearest 10
- 21,010
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,006
- Number after
- 21,008
- In binary
101001000001111
Quick check
What number comes just after 21,007?
Show the answer
21,008
Is 21,007 even or odd?
Show the answer
Odd
What is 21,007 + 10?
Show the answer
21,017
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 21,007 in words?
21,007 is written "twenty-one thousand seven".
Is 21,007 a prime number?
No. 21,007 is a composite number, because it has more than two factors.
What are the factors of 21,007?
The factors of 21,007 are 1, 7, 3,001 and 21,007.