21,249 in words
21,249
twenty-one thousand two hundred forty-nine
21,249 is written twenty-one thousand two hundred forty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred forty-ninth
- Expanded form
- 20,000 + 1,000 + 200 + 40 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 4 | 40 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 27, 787, 2,361, 7,083 and 21,249 (8 factors)
- First 10 multiples
- 21,249, 42,498, 63,747, 84,996, 106,245, 127,494, 148,743, 169,992, 191,241, 212,490
- Square
- 21,249 × 21,249 = 451,520,001
- Square root
- ≈ 145.77
- Sum of the digits
- 2 + 1 + 2 + 4 + 9 = 18
- Rounded to the nearest 10
- 21,250
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,248
- Number after
- 21,250
- In binary
101001100000001
Quick check
What number comes just after 21,249?
Show the answer
21,250
Is 21,249 even or odd?
Show the answer
Odd
What is 21,249 + 10?
Show the answer
21,259
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 21,249 in words?
21,249 is written "twenty-one thousand two hundred forty-nine".
Is 21,249 a prime number?
No. 21,249 is a composite number, because it has more than two factors.
What are the factors of 21,249?
The factors of 21,249 are 1, 3, 9, 27, 787, 2,361, 7,083 and 21,249.