21,742 in words
21,742
twenty-one thousand seven hundred forty-two
21,742 is written twenty-one thousand seven hundred forty-two.
Ways to write it
- As an ordinal
- twenty-one thousand seven hundred forty-second
- Expanded form
- 20,000 + 1,000 + 700 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 7 | 700 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 7, 14, 1,553, 3,106, 10,871 and 21,742 (8 factors)
- First 10 multiples
- 21,742, 43,484, 65,226, 86,968, 108,710, 130,452, 152,194, 173,936, 195,678, 217,420
- Square
- 21,742 × 21,742 = 472,714,564
- Square root
- ≈ 147.45
- Sum of the digits
- 2 + 1 + 7 + 4 + 2 = 16
- Rounded to the nearest 10
- 21,740
- Rounded to the nearest 100
- 21,700
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,741
- Number after
- 21,743
- In binary
101010011101110
Quick check
What number comes just after 21,742?
Show the answer
21,743
Is 21,742 even or odd?
Show the answer
Even
What is 21,742 + 10?
Show the answer
21,752
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 21,742 in words?
21,742 is written "twenty-one thousand seven hundred forty-two".
Is 21,742 a prime number?
No. 21,742 is a composite number, because it has more than two factors.
What are the factors of 21,742?
The factors of 21,742 are 1, 2, 7, 14, 1,553, 3,106, 10,871 and 21,742.