21,489 in words
21,489
twenty-one thousand four hundred eighty-nine
21,489 is written twenty-one thousand four hundred eighty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred eighty-ninth
- Expanded form
- 20,000 + 1,000 + 400 + 80 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 8 | 80 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 13, 19, 29, 39, 57, 87, 247, 377, 551, 741, 1,131, 1,653, 7,163 and 21,489 (16 factors)
- First 10 multiples
- 21,489, 42,978, 64,467, 85,956, 107,445, 128,934, 150,423, 171,912, 193,401, 214,890
- Square
- 21,489 × 21,489 = 461,777,121
- Square root
- ≈ 146.59
- Sum of the digits
- 2 + 1 + 4 + 8 + 9 = 24
- Rounded to the nearest 10
- 21,490
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,488
- Number after
- 21,490
- In binary
101001111110001
Quick check
What number comes just after 21,489?
Show the answer
21,490
Is 21,489 even or odd?
Show the answer
Odd
What is 21,489 + 10?
Show the answer
21,499
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 21,489 in words?
21,489 is written "twenty-one thousand four hundred eighty-nine".
Is 21,489 a prime number?
No. 21,489 is a composite number, because it has more than two factors.
What are the factors of 21,489?
The factors of 21,489 are 1, 3, 13, 19, 29, 39, 57, 87, 247, 377, 551, 741, 1,131, 1,653, 7,163 and 21,489.