21,171 in words
21,171
twenty-one thousand one hundred and seventy-one
21,171 is written twenty-one thousand one hundred and seventy-one.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred and seventy-first
- Expanded form
- 20,000 + 1,000 + 100 + 70 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 7 | 70 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7,057 and 21,171 (4 factors)
- First 10 multiples
- 21,171, 42,342, 63,513, 84,684, 105,855, 127,026, 148,197, 169,368, 190,539, 211,710
- Square
- 21,171 × 21,171 = 448,211,241
- Square root
- ≈ 145.50
- Sum of the digits
- 2 + 1 + 1 + 7 + 1 = 12
- Rounded to the nearest 10
- 21,170
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,170
- Number after
- 21,172
- In binary
101001010110011
Quick check
What number comes just after 21,171?
Show the answer
21,172
Is 21,171 even or odd?
Show the answer
Odd
What is 21,171 + 10?
Show the answer
21,181
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 21,171 in words?
21,171 is written "twenty-one thousand one hundred and seventy-one".
Is 21,171 a prime number?
No. 21,171 is a composite number, because it has more than two factors.
What are the factors of 21,171?
The factors of 21,171 are 1, 3, 7,057 and 21,171.