18,021 in words
18,021
eighteen thousand and twenty-one
18,021 is written eighteen thousand and twenty-one.
Ways to write it
- As an ordinal
- eighteen thousand and twenty-first
- Expanded form
- 10,000 + 8,000 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 1 | 10,000 |
| thousands | 8 | 8,000 |
| hundreds | 0 | 0 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 6,007 and 18,021 (4 factors)
- First 10 multiples
- 18,021, 36,042, 54,063, 72,084, 90,105, 108,126, 126,147, 144,168, 162,189, 180,210
- Square
- 18,021 × 18,021 = 324,756,441
- Square root
- ≈ 134.24
- Sum of the digits
- 1 + 8 + 0 + 2 + 1 = 12
- Rounded to the nearest 10
- 18,020
- Rounded to the nearest 100
- 18,000
- Rounded to the nearest 1000
- 18,000
- Number before
- 18,020
- Number after
- 18,022
- In binary
100011001100101
Quick check
What number comes just after 18,021?
Show the answer
18,022
Is 18,021 even or odd?
Show the answer
Odd
What is 18,021 + 10?
Show the answer
18,031
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 18,021 in words?
18,021 is written "eighteen thousand and twenty-one".
Is 18,021 a prime number?
No. 18,021 is a composite number, because it has more than two factors.
What are the factors of 18,021?
The factors of 18,021 are 1, 3, 6,007 and 18,021.