6,421 in words
6,421
six thousand four hundred and twenty-one
6,421 is written six thousand four hundred and twenty-one.
Ways to write it
- As an ordinal
- six thousand four hundred and twenty-first
- Expanded form
- 6,000 + 400 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 6 | 6,000 |
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 6,421 (2 factors)
- First 10 multiples
- 6,421, 12,842, 19,263, 25,684, 32,105, 38,526, 44,947, 51,368, 57,789, 64,210
- Square
- 6,421 × 6,421 = 41,229,241
- Square root
- ≈ 80.13
- Sum of the digits
- 6 + 4 + 2 + 1 = 13
- Rounded to the nearest 10
- 6,420
- Rounded to the nearest 100
- 6,400
- Rounded to the nearest 1000
- 6,000
- Number before
- 6,420
- Number after
- 6,422
- In binary
1100100010101
Quick check
What number comes just after 6,421?
Show the answer
6,422
Is 6,421 even or odd?
Show the answer
Odd
What is 6,421 + 10?
Show the answer
6,431
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 6,421 in words?
6,421 is written "six thousand four hundred and twenty-one".
Is 6,421 a prime number?
Yes. 6,421 is a prime number: its only factors are 1 and 6,421.
What are the factors of 6,421?
The factors of 6,421 are 1 and 6,421.