21,172 in words
21,172
twenty-one thousand one hundred seventy-two
21,172 is written twenty-one thousand one hundred seventy-two.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred seventy-second
- Expanded form
- 20,000 + 1,000 + 100 + 70 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 7 | 70 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 67, 79, 134, 158, 268, 316, 5,293, 10,586 and 21,172 (12 factors)
- First 10 multiples
- 21,172, 42,344, 63,516, 84,688, 105,860, 127,032, 148,204, 169,376, 190,548, 211,720
- Square
- 21,172 × 21,172 = 448,253,584
- Square root
- ≈ 145.51
- Sum of the digits
- 2 + 1 + 1 + 7 + 2 = 13
- Rounded to the nearest 10
- 21,170
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,171
- Number after
- 21,173
- In binary
101001010110100
Quick check
What number comes just after 21,172?
Show the answer
21,173
Is 21,172 even or odd?
Show the answer
Even
What is 21,172 + 10?
Show the answer
21,182
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 21,172 in words?
21,172 is written "twenty-one thousand one hundred seventy-two".
Is 21,172 a prime number?
No. 21,172 is a composite number, because it has more than two factors.
What are the factors of 21,172?
The factors of 21,172 are 1, 2, 4, 67, 79, 134, 158, 268, 316, 5,293, 10,586 and 21,172.