21,142 in words
21,142
twenty-one thousand one hundred forty-two
21,142 is written twenty-one thousand one hundred forty-two.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred forty-second
- Expanded form
- 20,000 + 1,000 + 100 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 11, 22, 31, 62, 341, 682, 961, 1,922, 10,571 and 21,142 (12 factors)
- First 10 multiples
- 21,142, 42,284, 63,426, 84,568, 105,710, 126,852, 147,994, 169,136, 190,278, 211,420
- Square
- 21,142 × 21,142 = 446,984,164
- Square root
- ≈ 145.40
- Sum of the digits
- 2 + 1 + 1 + 4 + 2 = 10
- Rounded to the nearest 10
- 21,140
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,141
- Number after
- 21,143
- In binary
101001010010110
Quick check
What number comes just after 21,142?
Show the answer
21,143
Is 21,142 even or odd?
Show the answer
Even
What is 21,142 + 10?
Show the answer
21,152
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 21,142 in words?
21,142 is written "twenty-one thousand one hundred forty-two".
Is 21,142 a prime number?
No. 21,142 is a composite number, because it has more than two factors.
What are the factors of 21,142?
The factors of 21,142 are 1, 2, 11, 22, 31, 62, 341, 682, 961, 1,922, 10,571 and 21,142.