21,507 in words
21,507
twenty-one thousand five hundred seven
21,507 is written twenty-one thousand five hundred seven.
Ways to write it
- As an ordinal
- twenty-one thousand five hundred seventh
- Expanded form
- 20,000 + 1,000 + 500 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 5 | 500 |
| tens | 0 | 0 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 67, 107, 201, 321, 7,169 and 21,507 (8 factors)
- First 10 multiples
- 21,507, 43,014, 64,521, 86,028, 107,535, 129,042, 150,549, 172,056, 193,563, 215,070
- Square
- 21,507 × 21,507 = 462,551,049
- Square root
- ≈ 146.65
- Sum of the digits
- 2 + 1 + 5 + 0 + 7 = 15
- Rounded to the nearest 10
- 21,510
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,506
- Number after
- 21,508
- In binary
101010000000011
Quick check
What number comes just after 21,507?
Show the answer
21,508
Is 21,507 even or odd?
Show the answer
Odd
What is 21,507 + 10?
Show the answer
21,517
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 21,507 in words?
21,507 is written "twenty-one thousand five hundred seven".
Is 21,507 a prime number?
No. 21,507 is a composite number, because it has more than two factors.
What are the factors of 21,507?
The factors of 21,507 are 1, 3, 67, 107, 201, 321, 7,169 and 21,507.