The number 21325
21325 is a composite number with 6 divisors. Its prime factorisation is Ć 853. Divisors (6): 1, 5, 25, 853, 4265, 21325.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21325 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21325 is composite. Its prime factorisation is
- 3
The divisors add up to 26474; without 21325 itself that is 5149, so 21325 is deficient (5149 is less than 21325). Euler's totient Ļ(21325) = 17040 numbers up to 21325 share no factor with it.
- 4
The digits of 21325 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 56 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21325 = 5^{2} \times 853 \]21325 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 26474 |
| Euler totient Ļ(n) | 17040 |
| Square | 454755625 |
| Cube | 9697663703125 |
| Square root | 146.030819 (= 5ā853) |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 56 |
| Scientific notation | 2.1325 Ć |
21325 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand three hundred and twenty-five |
| Binary (base 2) | 101001101001101 |
| Octal (base 8) | 51515 |
| Hexadecimal (base 16) | 534D |
| Base 3 | 1002020211 |
| As time | 21325 seconds = 5 h 55 min 25 s |
Is 21325 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (21325 Ć· 5 = 4265) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21325 a prime number?
No. 21325 = Ć 853, so it is divisible by 5.
What are the factors of 21325?
1, 5, 25, 853, 4265, 21325.
What is 21325 in binary?
101001101001101 (hexadecimal 534D, octal 51515).
What is the square root of 21325?
About 146.0308, exactly 5ā853.
Is 21325 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 21325?
It is a composite number with 6 divisors.