21,431 in words
21,431
twenty-one thousand four hundred thirty-one
21,431 is written twenty-one thousand four hundred thirty-one.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred thirty-first
- Expanded form
- 20,000 + 1,000 + 400 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 29, 739 and 21,431 (4 factors)
- First 10 multiples
- 21,431, 42,862, 64,293, 85,724, 107,155, 128,586, 150,017, 171,448, 192,879, 214,310
- Square
- 21,431 × 21,431 = 459,287,761
- Square root
- ≈ 146.39
- Sum of the digits
- 2 + 1 + 4 + 3 + 1 = 11
- Rounded to the nearest 10
- 21,430
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,430
- Number after
- 21,432
- In binary
101001110110111
Quick check
What number comes just after 21,431?
Show the answer
21,432
Is 21,431 even or odd?
Show the answer
Odd
What is 21,431 + 10?
Show the answer
21,441
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 21,431 in words?
21,431 is written "twenty-one thousand four hundred thirty-one".
Is 21,431 a prime number?
No. 21,431 is a composite number, because it has more than two factors.
What are the factors of 21,431?
The factors of 21,431 are 1, 29, 739 and 21,431.