21,018 in words
21,018
twenty-one thousand eighteen
21,018 is written twenty-one thousand eighteen.
Ways to write it
- As an ordinal
- twenty-one thousand eighteenth
- Expanded form
- 20,000 + 1,000 + 10 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 1 | 10 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 6, 31, 62, 93, 113, 186, 226, 339, 678, 3,503, 7,006, 10,509 and 21,018 (16 factors)
- First 10 multiples
- 21,018, 42,036, 63,054, 84,072, 105,090, 126,108, 147,126, 168,144, 189,162, 210,180
- Square
- 21,018 × 21,018 = 441,756,324
- Square root
- ≈ 144.98
- Sum of the digits
- 2 + 1 + 0 + 1 + 8 = 12
- Rounded to the nearest 10
- 21,020
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,017
- Number after
- 21,019
- In binary
101001000011010
Quick check
What number comes just after 21,018?
Show the answer
21,019
Is 21,018 even or odd?
Show the answer
Even
What is 21,018 + 10?
Show the answer
21,028
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 21,018 in words?
21,018 is written "twenty-one thousand eighteen".
Is 21,018 a prime number?
No. 21,018 is a composite number, because it has more than two factors.
What are the factors of 21,018?
The factors of 21,018 are 1, 2, 3, 6, 31, 62, 93, 113, 186, 226, 339, 678, 3,503, 7,006, 10,509 and 21,018.