21,170 in words
21,170
twenty-one thousand one hundred seventy
21,170 is written twenty-one thousand one hundred seventy.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred seventieth
- Expanded form
- 20,000 + 1,000 + 100 + 70
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 7 | 70 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 5, 10, 29, 58, 73, 145, 146, 290, 365, 730, 2,117, 4,234, 10,585 and 21,170 (16 factors)
- First 10 multiples
- 21,170, 42,340, 63,510, 84,680, 105,850, 127,020, 148,190, 169,360, 190,530, 211,700
- Square
- 21,170 × 21,170 = 448,168,900
- Square root
- ≈ 145.50
- Sum of the digits
- 2 + 1 + 1 + 7 + 0 = 11
- Rounded to the nearest 10
- 21,170
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,169
- Number after
- 21,171
- In binary
101001010110010
Quick check
What number comes just after 21,170?
Show the answer
21,171
Is 21,170 even or odd?
Show the answer
Even
What is 21,170 + 10?
Show the answer
21,180
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 21,170 in words?
21,170 is written "twenty-one thousand one hundred seventy".
Is 21,170 a prime number?
No. 21,170 is a composite number, because it has more than two factors.
What are the factors of 21,170?
The factors of 21,170 are 1, 2, 5, 10, 29, 58, 73, 145, 146, 290, 365, 730, 2,117, 4,234, 10,585 and 21,170.