21,070 in words
21,070
twenty-one thousand and seventy
21,070 is written twenty-one thousand and seventy.
Ways to write it
- As an ordinal
- twenty-one thousand and seventieth
- Expanded form
- 20,000 + 1,000 + 70
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 7 | 70 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 5, 7, 10, 14, 35, 43, 49, 70, 86, 98, 215, 245, 301, 430, 490, 602, 1,505, 2,107, 3,010, 4,214, 10,535 and 21,070 (24 factors)
- First 10 multiples
- 21,070, 42,140, 63,210, 84,280, 105,350, 126,420, 147,490, 168,560, 189,630, 210,700
- Square
- 21,070 × 21,070 = 443,944,900
- Square root
- ≈ 145.16
- Sum of the digits
- 2 + 1 + 0 + 7 + 0 = 10
- Rounded to the nearest 10
- 21,070
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,069
- Number after
- 21,071
- In binary
101001001001110
Quick check
What number comes just after 21,070?
Show the answer
21,071
Is 21,070 even or odd?
Show the answer
Even
What is 21,070 + 10?
Show the answer
21,080
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 21,070 in words?
21,070 is written "twenty-one thousand and seventy".
Is 21,070 a prime number?
No. 21,070 is a composite number, because it has more than two factors.
What are the factors of 21,070?
The factors of 21,070 are 1, 2, 5, 7, 10, 14, 35, 43, 49, 70, 86, 98, 215, 245, 301, 430, 490, 602, 1,505, 2,107, 3,010, 4,214, 10,535 and 21,070.