21,157 in words
21,157
twenty-one thousand one hundred fifty-seven
21,157 is written twenty-one thousand one hundred fifty-seven.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred fifty-seventh
- Expanded form
- 20,000 + 1,000 + 100 + 50 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 5 | 50 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,157 (2 factors)
- First 10 multiples
- 21,157, 42,314, 63,471, 84,628, 105,785, 126,942, 148,099, 169,256, 190,413, 211,570
- Square
- 21,157 × 21,157 = 447,618,649
- Square root
- ≈ 145.45
- Sum of the digits
- 2 + 1 + 1 + 5 + 7 = 16
- Rounded to the nearest 10
- 21,160
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,156
- Number after
- 21,158
- In binary
101001010100101
Quick check
What number comes just after 21,157?
Show the answer
21,158
Is 21,157 even or odd?
Show the answer
Odd
What is 21,157 + 10?
Show the answer
21,167
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 21,157 in words?
21,157 is written "twenty-one thousand one hundred fifty-seven".
Is 21,157 a prime number?
Yes. 21,157 is a prime number: its only factors are 1 and 21,157.
What are the factors of 21,157?
The factors of 21,157 are 1 and 21,157.