21,006 in words
21,006
twenty-one thousand and six
21,006 is written twenty-one thousand and six.
Ways to write it
- As an ordinal
- twenty-one thousand and sixth
- Expanded form
- 20,000 + 1,000 + 6
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 6 | 6 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 6, 9, 18, 27, 54, 389, 778, 1,167, 2,334, 3,501, 7,002, 10,503 and 21,006 (16 factors)
- First 10 multiples
- 21,006, 42,012, 63,018, 84,024, 105,030, 126,036, 147,042, 168,048, 189,054, 210,060
- Square
- 21,006 × 21,006 = 441,252,036
- Square root
- ≈ 144.93
- Sum of the digits
- 2 + 1 + 0 + 0 + 6 = 9
- Rounded to the nearest 10
- 21,010
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,005
- Number after
- 21,007
- In binary
101001000001110
Quick check
What number comes just after 21,006?
Show the answer
21,007
Is 21,006 even or odd?
Show the answer
Even
What is 21,006 + 10?
Show the answer
21,016
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 21,006 in words?
21,006 is written "twenty-one thousand and six".
Is 21,006 a prime number?
No. 21,006 is a composite number, because it has more than two factors.
What are the factors of 21,006?
The factors of 21,006 are 1, 2, 3, 6, 9, 18, 27, 54, 389, 778, 1,167, 2,334, 3,501, 7,002, 10,503 and 21,006.