21,321 in words
21,321
twenty-one thousand three hundred and twenty-one
21,321 is written twenty-one thousand three hundred and twenty-one.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred and twenty-first
- Expanded form
- 20,000 + 1,000 + 300 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 23, 69, 103, 207, 309, 927, 2,369, 7,107 and 21,321 (12 factors)
- First 10 multiples
- 21,321, 42,642, 63,963, 85,284, 106,605, 127,926, 149,247, 170,568, 191,889, 213,210
- Square
- 21,321 × 21,321 = 454,585,041
- Square root
- ≈ 146.02
- Sum of the digits
- 2 + 1 + 3 + 2 + 1 = 9
- Rounded to the nearest 10
- 21,320
- Rounded to the nearest 100
- 21,300
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,320
- Number after
- 21,322
- In binary
101001101001001
Quick check
What number comes just after 21,321?
Show the answer
21,322
Is 21,321 even or odd?
Show the answer
Odd
What is 21,321 + 10?
Show the answer
21,331
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 21,321 in words?
21,321 is written "twenty-one thousand three hundred and twenty-one".
Is 21,321 a prime number?
No. 21,321 is a composite number, because it has more than two factors.
What are the factors of 21,321?
The factors of 21,321 are 1, 3, 9, 23, 69, 103, 207, 309, 927, 2,369, 7,107 and 21,321.