21,245 in words
21,245
twenty-one thousand two hundred and forty-five
21,245 is written twenty-one thousand two hundred and forty-five.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred and forty-fifth
- Expanded form
- 20,000 + 1,000 + 200 + 40 + 5
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 4 | 40 |
| ones | 5 | 5 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 5, 7, 35, 607, 3,035, 4,249 and 21,245 (8 factors)
- First 10 multiples
- 21,245, 42,490, 63,735, 84,980, 106,225, 127,470, 148,715, 169,960, 191,205, 212,450
- Square
- 21,245 × 21,245 = 451,350,025
- Square root
- ≈ 145.76
- Sum of the digits
- 2 + 1 + 2 + 4 + 5 = 14
- Rounded to the nearest 10
- 21,250
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,244
- Number after
- 21,246
- In binary
101001011111101
Quick check
What number comes just after 21,245?
Show the answer
21,246
Is 21,245 even or odd?
Show the answer
Odd
What is 21,245 + 10?
Show the answer
21,255
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 21,245 in words?
21,245 is written "twenty-one thousand two hundred and forty-five".
Is 21,245 a prime number?
No. 21,245 is a composite number, because it has more than two factors.
What are the factors of 21,245?
The factors of 21,245 are 1, 5, 7, 35, 607, 3,035, 4,249 and 21,245.