The number 21327
21327 is a composite number with 4 divisors. Its prime factorisation is 3 × 7109. Divisors (4): 1, 3, 7109, 21327.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 21327: a semiprime: 3 × 7109, the product of two primes.
- 2
21327 is composite. Its prime factorisation is
- 3
The divisors add up to 28440; without 21327 itself that is 7113, so 21327 is deficient (7113 is less than 21327). Euler's totient φ(21327) = 14216 numbers up to 21327 share no factor with it.
- 4
The digits of 21327 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 56 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21327 = 3 \times 7109 \]
21327 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 28440 |
| Euler totient φ(n) | 14216 |
| Square | 454840929 |
| Cube | 9700392492783 |
| Square root | 146.037666 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 56 |
| Scientific notation | 2.1327 × |
21327 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand three hundred and twenty-seven |
| Binary (base 2) | 101001101001111 |
| Octal (base 8) | 51517 |
| Hexadecimal (base 16) | 534F |
| Base 3 | 1002020220 |
| As time | 21327 seconds = 5 h 55 min 27 s |
Is 21327 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 | Yes (21327 ÷ 3 = 7109) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 6) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21327 a prime number?
No. 21327 = 3 × 7109, so it is divisible by 3.
What are the factors of 21327?
1, 3, 7109, 21327.
What is 21327 in binary?
101001101001111 (hexadecimal 534F, octal 51517).
What is the square root of 21327?
About 146.0377.
Is 21327 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 21327?
21327 is a semiprime: 3 × 7109, the product of two primes.