21,520 in words
21,520
twenty-one thousand five hundred twenty
21,520 is written twenty-one thousand five hundred twenty.
Ways to write it
- As an ordinal
- twenty-one thousand five hundred twentieth
- Expanded form
- 20,000 + 1,000 + 500 + 20
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 5 | 500 |
| tens | 2 | 20 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269, 538, 1,076, 1,345, 2,152, 2,690, 4,304, 5,380, 10,760 and 21,520 (20 factors)
- First 10 multiples
- 21,520, 43,040, 64,560, 86,080, 107,600, 129,120, 150,640, 172,160, 193,680, 215,200
- Square
- 21,520 × 21,520 = 463,110,400
- Square root
- ≈ 146.70
- Sum of the digits
- 2 + 1 + 5 + 2 + 0 = 10
- Rounded to the nearest 10
- 21,520
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,519
- Number after
- 21,521
- In binary
101010000010000
Quick check
What number comes just after 21,520?
Show the answer
21,521
Is 21,520 even or odd?
Show the answer
Even
What is 21,520 + 10?
Show the answer
21,530
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 21,520 in words?
21,520 is written "twenty-one thousand five hundred twenty".
Is 21,520 a prime number?
No. 21,520 is a composite number, because it has more than two factors.
What are the factors of 21,520?
The factors of 21,520 are 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269, 538, 1,076, 1,345, 2,152, 2,690, 4,304, 5,380, 10,760 and 21,520.