8,421 in words
8,421
eight thousand four hundred and twenty-one
8,421 is written eight thousand four hundred and twenty-one.
Ways to write it
- As an ordinal
- eight thousand four hundred and twenty-first
- Expanded form
- 8,000 + 400 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| 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, 3, 7, 21, 401, 1,203, 2,807 and 8,421 (8 factors)
- First 10 multiples
- 8,421, 16,842, 25,263, 33,684, 42,105, 50,526, 58,947, 67,368, 75,789, 84,210
- Square
- 8,421 × 8,421 = 7,09,13,241
- Square root
- ≈ 91.77
- Sum of the digits
- 8 + 4 + 2 + 1 = 15
- Rounded to the nearest 10
- 8,420
- Rounded to the nearest 100
- 8,400
- Rounded to the nearest 1000
- 8,000
- Number before
- 8,420
- Number after
- 8,422
- In binary
10000011100101
Quick check
What number comes just after 8,421?
Show the answer
8,422
Is 8,421 even or odd?
Show the answer
Odd
What is 8,421 + 10?
Show the answer
8,431
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 8,421 in words?
8,421 is written "eight thousand four hundred and twenty-one".
Is 8,421 a prime number?
No. 8,421 is a composite number, because it has more than two factors.
What are the factors of 8,421?
The factors of 8,421 are 1, 3, 7, 21, 401, 1,203, 2,807 and 8,421.