21,542 in words
21,542
twenty-one thousand five hundred forty-two
21,542 is written twenty-one thousand five hundred forty-two.
Ways to write it
- As an ordinal
- twenty-one thousand five hundred forty-second
- Expanded form
- 20,000 + 1,000 + 500 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 5 | 500 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 10,771 and 21,542 (4 factors)
- First 10 multiples
- 21,542, 43,084, 64,626, 86,168, 107,710, 129,252, 150,794, 172,336, 193,878, 215,420
- Square
- 21,542 × 21,542 = 464,057,764
- Square root
- ≈ 146.77
- Sum of the digits
- 2 + 1 + 5 + 4 + 2 = 14
- Rounded to the nearest 10
- 21,540
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,541
- Number after
- 21,543
- In binary
101010000100110
Quick check
What number comes just after 21,542?
Show the answer
21,543
Is 21,542 even or odd?
Show the answer
Even
What is 21,542 + 10?
Show the answer
21,552
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 21,542 in words?
21,542 is written "twenty-one thousand five hundred forty-two".
Is 21,542 a prime number?
No. 21,542 is a composite number, because it has more than two factors.
What are the factors of 21,542?
The factors of 21,542 are 1, 2, 10,771 and 21,542.