21,057 in words
21,057
twenty-one thousand and fifty-seven
21,057 is written twenty-one thousand and fifty-seven.
Ways to write it
- As an ordinal
- twenty-one thousand and fifty-seventh
- Expanded form
- 20,000 + 1,000 + 50 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 5 | 50 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7,019 and 21,057 (4 factors)
- First 10 multiples
- 21,057, 42,114, 63,171, 84,228, 105,285, 126,342, 147,399, 168,456, 189,513, 210,570
- Square
- 21,057 × 21,057 = 443,397,249
- Square root
- ≈ 145.11
- Sum of the digits
- 2 + 1 + 0 + 5 + 7 = 15
- Rounded to the nearest 10
- 21,060
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,056
- Number after
- 21,058
- In binary
101001001000001
Quick check
What number comes just after 21,057?
Show the answer
21,058
Is 21,057 even or odd?
Show the answer
Odd
What is 21,057 + 10?
Show the answer
21,067
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 21,057 in words?
21,057 is written "twenty-one thousand and fifty-seven".
Is 21,057 a prime number?
No. 21,057 is a composite number, because it has more than two factors.
What are the factors of 21,057?
The factors of 21,057 are 1, 3, 7,019 and 21,057.