21,501 in words
21,501
twenty-one thousand five hundred one
21,501 is written twenty-one thousand five hundred one.
Ways to write it
- As an ordinal
- twenty-one thousand five hundred first
- Expanded form
- 20,000 + 1,000 + 500 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 5 | 500 |
| tens | 0 | 0 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 2,389, 7,167 and 21,501 (6 factors)
- First 10 multiples
- 21,501, 43,002, 64,503, 86,004, 107,505, 129,006, 150,507, 172,008, 193,509, 215,010
- Square
- 21,501 × 21,501 = 462,293,001
- Square root
- ≈ 146.63
- Sum of the digits
- 2 + 1 + 5 + 0 + 1 = 9
- Rounded to the nearest 10
- 21,500
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,500
- Number after
- 21,502
- In binary
101001111111101
Quick check
What number comes just after 21,501?
Show the answer
21,502
Is 21,501 even or odd?
Show the answer
Odd
What is 21,501 + 10?
Show the answer
21,511
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 21,501 in words?
21,501 is written "twenty-one thousand five hundred one".
Is 21,501 a prime number?
No. 21,501 is a composite number, because it has more than two factors.
What are the factors of 21,501?
The factors of 21,501 are 1, 3, 9, 2,389, 7,167 and 21,501.