21,442 in words
21,442
twenty-one thousand four hundred forty-two
21,442 is written twenty-one thousand four hundred forty-two.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred forty-second
- Expanded form
- 20,000 + 1,000 + 400 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 71, 142, 151, 302, 10,721 and 21,442 (8 factors)
- First 10 multiples
- 21,442, 42,884, 64,326, 85,768, 107,210, 128,652, 150,094, 171,536, 192,978, 214,420
- Square
- 21,442 × 21,442 = 459,759,364
- Square root
- ≈ 146.43
- Sum of the digits
- 2 + 1 + 4 + 4 + 2 = 13
- Rounded to the nearest 10
- 21,440
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,441
- Number after
- 21,443
- In binary
101001111000010
Quick check
What number comes just after 21,442?
Show the answer
21,443
Is 21,442 even or odd?
Show the answer
Even
What is 21,442 + 10?
Show the answer
21,452
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 21,442 in words?
21,442 is written "twenty-one thousand four hundred forty-two".
Is 21,442 a prime number?
No. 21,442 is a composite number, because it has more than two factors.
What are the factors of 21,442?
The factors of 21,442 are 1, 2, 71, 142, 151, 302, 10,721 and 21,442.