21,224 in words
21,224
twenty-one thousand two hundred twenty-four
21,224 is written twenty-one thousand two hundred twenty-four.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred twenty-fourth
- Expanded form
- 20,000 + 1,000 + 200 + 20 + 4
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 2 | 20 |
| ones | 4 | 4 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 7, 8, 14, 28, 56, 379, 758, 1,516, 2,653, 3,032, 5,306, 10,612 and 21,224 (16 factors)
- First 10 multiples
- 21,224, 42,448, 63,672, 84,896, 106,120, 127,344, 148,568, 169,792, 191,016, 212,240
- Square
- 21,224 × 21,224 = 450,458,176
- Square root
- ≈ 145.68
- Sum of the digits
- 2 + 1 + 2 + 2 + 4 = 11
- Rounded to the nearest 10
- 21,220
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,223
- Number after
- 21,225
- In binary
101001011101000
Quick check
What number comes just after 21,224?
Show the answer
21,225
Is 21,224 even or odd?
Show the answer
Even
What is 21,224 + 10?
Show the answer
21,234
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 21,224 in words?
21,224 is written "twenty-one thousand two hundred twenty-four".
Is 21,224 a prime number?
No. 21,224 is a composite number, because it has more than two factors.
What are the factors of 21,224?
The factors of 21,224 are 1, 2, 4, 7, 8, 14, 28, 56, 379, 758, 1,516, 2,653, 3,032, 5,306, 10,612 and 21,224.