18,421 in words
18,421
eighteen thousand four hundred twenty-one
18,421 is written eighteen thousand four hundred twenty-one.
Ways to write it
- As an ordinal
- eighteen thousand four hundred twenty-first
- Expanded form
- 10,000 + 8,000 + 400 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 1 | 10,000 |
| thousands | 8 | 8,000 |
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 13, 109, 169, 1,417 and 18,421 (6 factors)
- First 10 multiples
- 18,421, 36,842, 55,263, 73,684, 92,105, 110,526, 128,947, 147,368, 165,789, 184,210
- Square
- 18,421 × 18,421 = 339,333,241
- Square root
- ≈ 135.72
- Sum of the digits
- 1 + 8 + 4 + 2 + 1 = 16
- Rounded to the nearest 10
- 18,420
- Rounded to the nearest 100
- 18,400
- Rounded to the nearest 1000
- 18,000
- Number before
- 18,420
- Number after
- 18,422
- In binary
100011111110101
Quick check
What number comes just after 18,421?
Show the answer
18,422
Is 18,421 even or odd?
Show the answer
Odd
What is 18,421 + 10?
Show the answer
18,431
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
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How do you write 18,421 in words?
18,421 is written "eighteen thousand four hundred twenty-one".
Is 18,421 a prime number?
No. 18,421 is a composite number, because it has more than two factors.
What are the factors of 18,421?
The factors of 18,421 are 1, 13, 109, 169, 1,417 and 18,421.