21,357 in words
21,357
twenty-one thousand three hundred fifty-seven
21,357 is written twenty-one thousand three hundred fifty-seven.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred fifty-seventh
- Expanded form
- 20,000 + 1,000 + 300 + 50 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 5 | 50 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7, 9, 21, 27, 63, 113, 189, 339, 791, 1,017, 2,373, 3,051, 7,119 and 21,357 (16 factors)
- First 10 multiples
- 21,357, 42,714, 64,071, 85,428, 106,785, 128,142, 149,499, 170,856, 192,213, 213,570
- Square
- 21,357 × 21,357 = 456,121,449
- Square root
- ≈ 146.14
- Sum of the digits
- 2 + 1 + 3 + 5 + 7 = 18
- Rounded to the nearest 10
- 21,360
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,356
- Number after
- 21,358
- In binary
101001101101101
Quick check
What number comes just after 21,357?
Show the answer
21,358
Is 21,357 even or odd?
Show the answer
Odd
What is 21,357 + 10?
Show the answer
21,367
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 21,357 in words?
21,357 is written "twenty-one thousand three hundred fifty-seven".
Is 21,357 a prime number?
No. 21,357 is a composite number, because it has more than two factors.
What are the factors of 21,357?
The factors of 21,357 are 1, 3, 7, 9, 21, 27, 63, 113, 189, 339, 791, 1,017, 2,373, 3,051, 7,119 and 21,357.