21,642 in words
21,642
twenty-one thousand six hundred forty-two
21,642 is written twenty-one thousand six hundred forty-two.
Ways to write it
- As an ordinal
- twenty-one thousand six hundred forty-second
- Expanded form
- 20,000 + 1,000 + 600 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 6 | 600 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 6, 3,607, 7,214, 10,821 and 21,642 (8 factors)
- First 10 multiples
- 21,642, 43,284, 64,926, 86,568, 108,210, 129,852, 151,494, 173,136, 194,778, 216,420
- Square
- 21,642 × 21,642 = 468,376,164
- Square root
- ≈ 147.11
- Sum of the digits
- 2 + 1 + 6 + 4 + 2 = 15
- Rounded to the nearest 10
- 21,640
- Rounded to the nearest 100
- 21,600
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,641
- Number after
- 21,643
- In binary
101010010001010
Quick check
What number comes just after 21,642?
Show the answer
21,643
Is 21,642 even or odd?
Show the answer
Even
What is 21,642 + 10?
Show the answer
21,652
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 21,642 in words?
21,642 is written "twenty-one thousand six hundred forty-two".
Is 21,642 a prime number?
No. 21,642 is a composite number, because it has more than two factors.
What are the factors of 21,642?
The factors of 21,642 are 1, 2, 3, 6, 3,607, 7,214, 10,821 and 21,642.