21,671 in words
21,671
twenty-one thousand six hundred and seventy-one
21,671 is written twenty-one thousand six hundred and seventy-one.
Ways to write it
- As an ordinal
- twenty-one thousand six hundred and seventy-first
- Expanded form
- 20,000 + 1,000 + 600 + 70 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 6 | 600 |
| tens | 7 | 70 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 13, 1,667 and 21,671 (4 factors)
- First 10 multiples
- 21,671, 43,342, 65,013, 86,684, 108,355, 130,026, 151,697, 173,368, 195,039, 216,710
- Square
- 21,671 × 21,671 = 469,632,241
- Square root
- ≈ 147.21
- Sum of the digits
- 2 + 1 + 6 + 7 + 1 = 17
- Rounded to the nearest 10
- 21,670
- Rounded to the nearest 100
- 21,700
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,670
- Number after
- 21,672
- In binary
101010010100111
Quick check
What number comes just after 21,671?
Show the answer
21,672
Is 21,671 even or odd?
Show the answer
Odd
What is 21,671 + 10?
Show the answer
21,681
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
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How do you write 21,671 in words?
21,671 is written "twenty-one thousand six hundred and seventy-one".
Is 21,671 a prime number?
No. 21,671 is a composite number, because it has more than two factors.
What are the factors of 21,671?
The factors of 21,671 are 1, 13, 1,667 and 21,671.