21,722 in words
21,722
twenty-one thousand seven hundred twenty-two
21,722 is written twenty-one thousand seven hundred twenty-two.
Ways to write it
- As an ordinal
- twenty-one thousand seven hundred twenty-second
- Expanded form
- 20,000 + 1,000 + 700 + 20 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 7 | 700 |
| tens | 2 | 20 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 10,861 and 21,722 (4 factors)
- First 10 multiples
- 21,722, 43,444, 65,166, 86,888, 108,610, 130,332, 152,054, 173,776, 195,498, 217,220
- Square
- 21,722 × 21,722 = 471,845,284
- Square root
- ≈ 147.38
- Sum of the digits
- 2 + 1 + 7 + 2 + 2 = 14
- Rounded to the nearest 10
- 21,720
- Rounded to the nearest 100
- 21,700
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,721
- Number after
- 21,723
- In binary
101010011011010
Quick check
What number comes just after 21,722?
Show the answer
21,723
Is 21,722 even or odd?
Show the answer
Even
What is 21,722 + 10?
Show the answer
21,732
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 21,722 in words?
21,722 is written "twenty-one thousand seven hundred twenty-two".
Is 21,722 a prime number?
No. 21,722 is a composite number, because it has more than two factors.
What are the factors of 21,722?
The factors of 21,722 are 1, 2, 10,861 and 21,722.