21,118 in words
21,118
twenty-one thousand one hundred and eighteen
21,118 is written twenty-one thousand one hundred and eighteen.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred and eighteenth
- Expanded form
- 20,000 + 1,000 + 100 + 10 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 1 | 10 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 10,559 and 21,118 (4 factors)
- First 10 multiples
- 21,118, 42,236, 63,354, 84,472, 105,590, 126,708, 147,826, 168,944, 190,062, 211,180
- Square
- 21,118 × 21,118 = 445,969,924
- Square root
- ≈ 145.32
- Sum of the digits
- 2 + 1 + 1 + 1 + 8 = 13
- Rounded to the nearest 10
- 21,120
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,117
- Number after
- 21,119
- In binary
101001001111110
Quick check
What number comes just after 21,118?
Show the answer
21,119
Is 21,118 even or odd?
Show the answer
Even
What is 21,118 + 10?
Show the answer
21,128
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 21,118 in words?
21,118 is written "twenty-one thousand one hundred and eighteen".
Is 21,118 a prime number?
No. 21,118 is a composite number, because it has more than two factors.
What are the factors of 21,118?
The factors of 21,118 are 1, 2, 10,559 and 21,118.