21,749 in words
21,749
twenty-one thousand seven hundred forty-nine
21,749 is written twenty-one thousand seven hundred forty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand seven hundred forty-ninth
- Expanded form
- 20,000 + 1,000 + 700 + 40 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 7 | 700 |
| tens | 4 | 40 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 7, 13, 91, 239, 1,673, 3,107 and 21,749 (8 factors)
- First 10 multiples
- 21,749, 43,498, 65,247, 86,996, 108,745, 130,494, 152,243, 173,992, 195,741, 217,490
- Square
- 21,749 × 21,749 = 473,019,001
- Square root
- ≈ 147.48
- Sum of the digits
- 2 + 1 + 7 + 4 + 9 = 23
- Rounded to the nearest 10
- 21,750
- Rounded to the nearest 100
- 21,700
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,748
- Number after
- 21,750
- In binary
101010011110101
Quick check
What number comes just after 21,749?
Show the answer
21,750
Is 21,749 even or odd?
Show the answer
Odd
What is 21,749 + 10?
Show the answer
21,759
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 21,749 in words?
21,749 is written "twenty-one thousand seven hundred forty-nine".
Is 21,749 a prime number?
No. 21,749 is a composite number, because it has more than two factors.
What are the factors of 21,749?
The factors of 21,749 are 1, 7, 13, 91, 239, 1,673, 3,107 and 21,749.