21,020 in words
21,020
twenty-one thousand twenty
21,020 is written twenty-one thousand twenty.
Ways to write it
- As an ordinal
- twenty-one thousand twentieth
- Expanded form
- 20,000 + 1,000 + 20
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 2 | 20 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 10, 20, 1,051, 2,102, 4,204, 5,255, 10,510 and 21,020 (12 factors)
- First 10 multiples
- 21,020, 42,040, 63,060, 84,080, 105,100, 126,120, 147,140, 168,160, 189,180, 210,200
- Square
- 21,020 × 21,020 = 441,840,400
- Square root
- ≈ 144.98
- Sum of the digits
- 2 + 1 + 0 + 2 + 0 = 5
- Rounded to the nearest 10
- 21,020
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,019
- Number after
- 21,021
- In binary
101001000011100
Quick check
What number comes just after 21,020?
Show the answer
21,021
Is 21,020 even or odd?
Show the answer
Even
What is 21,020 + 10?
Show the answer
21,030
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 21,020 in words?
21,020 is written "twenty-one thousand twenty".
Is 21,020 a prime number?
No. 21,020 is a composite number, because it has more than two factors.
What are the factors of 21,020?
The factors of 21,020 are 1, 2, 4, 5, 10, 20, 1,051, 2,102, 4,204, 5,255, 10,510 and 21,020.