20,421 in words
20,421
twenty thousand four hundred twenty-one
20,421 is written twenty thousand four hundred twenty-one.
Ways to write it
- As an ordinal
- twenty thousand four hundred twenty-first
- Expanded form
- 20,000 + 400 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 0 | 0 |
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 2,269, 6,807 and 20,421 (6 factors)
- First 10 multiples
- 20,421, 40,842, 61,263, 81,684, 102,105, 122,526, 142,947, 163,368, 183,789, 204,210
- Square
- 20,421 × 20,421 = 417,017,241
- Square root
- ≈ 142.90
- Sum of the digits
- 2 + 0 + 4 + 2 + 1 = 9
- Rounded to the nearest 10
- 20,420
- Rounded to the nearest 100
- 20,400
- Rounded to the nearest 1000
- 20,000
- Number before
- 20,420
- Number after
- 20,422
- In binary
100111111000101
Quick check
What number comes just after 20,421?
Show the answer
20,422
Is 20,421 even or odd?
Show the answer
Odd
What is 20,421 + 10?
Show the answer
20,431
Practice 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 20,421 in words?
20,421 is written "twenty thousand four hundred twenty-one".
Is 20,421 a prime number?
No. 20,421 is a composite number, because it has more than two factors.
What are the factors of 20,421?
The factors of 20,421 are 1, 3, 9, 2,269, 6,807 and 20,421.