21,401 in words
21,401
twenty-one thousand four hundred one
21,401 is written twenty-one thousand four hundred one.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred first
- Expanded form
- 20,000 + 1,000 + 400 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 0 | 0 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,401 (2 factors)
- First 10 multiples
- 21,401, 42,802, 64,203, 85,604, 107,005, 128,406, 149,807, 171,208, 192,609, 214,010
- Square
- 21,401 × 21,401 = 458,002,801
- Square root
- ≈ 146.29
- Sum of the digits
- 2 + 1 + 4 + 0 + 1 = 8
- Rounded to the nearest 10
- 21,400
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,400
- Number after
- 21,402
- In binary
101001110011001
Quick check
What number comes just after 21,401?
Show the answer
21,402
Is 21,401 even or odd?
Show the answer
Odd
What is 21,401 + 10?
Show the answer
21,411
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 21,401 in words?
21,401 is written "twenty-one thousand four hundred one".
Is 21,401 a prime number?
Yes. 21,401 is a prime number: its only factors are 1 and 21,401.
What are the factors of 21,401?
The factors of 21,401 are 1 and 21,401.