21,345 in words
21,345
twenty-one thousand three hundred forty-five
21,345 is written twenty-one thousand three hundred forty-five.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred forty-fifth
- Expanded form
- 20,000 + 1,000 + 300 + 40 + 5
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 4 | 40 |
| ones | 5 | 5 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 5, 15, 1,423, 4,269, 7,115 and 21,345 (8 factors)
- First 10 multiples
- 21,345, 42,690, 64,035, 85,380, 106,725, 128,070, 149,415, 170,760, 192,105, 213,450
- Square
- 21,345 × 21,345 = 455,609,025
- Square root
- ≈ 146.10
- Sum of the digits
- 2 + 1 + 3 + 4 + 5 = 15
- Rounded to the nearest 10
- 21,350
- Rounded to the nearest 100
- 21,300
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,344
- Number after
- 21,346
- In binary
101001101100001
Quick check
What number comes just after 21,345?
Show the answer
21,346
Is 21,345 even or odd?
Show the answer
Odd
What is 21,345 + 10?
Show the answer
21,355
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 21,345 in words?
21,345 is written "twenty-one thousand three hundred forty-five".
Is 21,345 a prime number?
No. 21,345 is a composite number, because it has more than two factors.
What are the factors of 21,345?
The factors of 21,345 are 1, 3, 5, 15, 1,423, 4,269, 7,115 and 21,345.