21,497 in words
21,497
twenty-one thousand four hundred ninety-seven
21,497 is written twenty-one thousand four hundred ninety-seven.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred ninety-seventh
- Expanded form
- 20,000 + 1,000 + 400 + 90 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 9 | 90 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 7, 37, 83, 259, 581, 3,071 and 21,497 (8 factors)
- First 10 multiples
- 21,497, 42,994, 64,491, 85,988, 107,485, 128,982, 150,479, 171,976, 193,473, 214,970
- Square
- 21,497 × 21,497 = 462,121,009
- Square root
- ≈ 146.62
- Sum of the digits
- 2 + 1 + 4 + 9 + 7 = 23
- Rounded to the nearest 10
- 21,500
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,496
- Number after
- 21,498
- In binary
101001111111001
Quick check
What number comes just after 21,497?
Show the answer
21,498
Is 21,497 even or odd?
Show the answer
Odd
What is 21,497 + 10?
Show the answer
21,507
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 21,497 in words?
21,497 is written "twenty-one thousand four hundred ninety-seven".
Is 21,497 a prime number?
No. 21,497 is a composite number, because it has more than two factors.
What are the factors of 21,497?
The factors of 21,497 are 1, 7, 37, 83, 259, 581, 3,071 and 21,497.