The number 21367
21367 is a composite number with 4 divisors. Its prime factorisation is 23 × 929. Divisors (4): 1, 23, 929, 21367.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 21367: a semiprime: 23 × 929, the product of two primes.
- 2
21367 is composite. Its prime factorisation is
- 3
The divisors add up to 22320; without 21367 itself that is 953, so 21367 is deficient (953 is less than 21367). Euler's totient φ(21367) = 20416 numbers up to 21367 share no factor with it.
- 4
The digits of 21367 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 100 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21367 = 23 \times 929 \]
21367 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 22320 |
| Euler totient φ(n) | 20416 |
| Square | 456548689 |
| Cube | 9755075837863 |
| Square root | 146.174553 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 100 |
| Scientific notation | 2.1367 × |
21367 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand three hundred and sixty-seven |
| Binary (base 2) | 101001101110111 |
| Octal (base 8) | 51567 |
| Hexadecimal (base 16) | 5377 |
| Base 3 | 1002022101 |
| As time | 21367 seconds = 5 h 56 min 7 s |
Is 21367 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21367 a prime number?
No. 21367 = 23 × 929, so it is divisible by 23.
What are the factors of 21367?
1, 23, 929, 21367.
What is 21367 in binary?
101001101110111 (hexadecimal 5377, octal 51567).
What is the square root of 21367?
About 146.1746.
Is 21367 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 21367?
21367 is a semiprime: 23 × 929, the product of two primes.