21,080 in words
21,080
twenty-one thousand eighty
21,080 is written twenty-one thousand eighty.
Ways to write it
- As an ordinal
- twenty-one thousand eightieth
- Expanded form
- 20,000 + 1,000 + 80
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 8 | 80 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 1,054, 1,240, 2,108, 2,635, 4,216, 5,270, 10,540 and 21,080 (32 factors)
- First 10 multiples
- 21,080, 42,160, 63,240, 84,320, 105,400, 126,480, 147,560, 168,640, 189,720, 210,800
- Square
- 21,080 × 21,080 = 444,366,400
- Square root
- ≈ 145.19
- Sum of the digits
- 2 + 1 + 0 + 8 + 0 = 11
- Rounded to the nearest 10
- 21,080
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,079
- Number after
- 21,081
- In binary
101001001011000
Quick check
What number comes just after 21,080?
Show the answer
21,081
Is 21,080 even or odd?
Show the answer
Even
What is 21,080 + 10?
Show the answer
21,090
Practice 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 21,080 in words?
21,080 is written "twenty-one thousand eighty".
Is 21,080 a prime number?
No. 21,080 is a composite number, because it has more than two factors.
What are the factors of 21,080?
The factors of 21,080 are 1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 1,054, 1,240, 2,108, 2,635, 4,216, 5,270, 10,540 and 21,080.