The number 16321
16321 is a composite number with 4 divisors. Its prime factorisation is 19 × 859. Divisors (4): 1, 19, 859, 16321.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16321: a semiprime: 19 × 859, the product of two primes.
- 2
16321 is composite. Its prime factorisation is
- 3
The divisors add up to 17200; without 16321 itself that is 879, so 16321 is deficient (879 is less than 16321). Euler's totient φ(16321) = 15444 numbers up to 16321 share no factor with it.
- 4
The digits of 16321 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 66 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16321 = 19 \times 859 \]
16321 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 17200 |
| Euler totient φ(n) | 15444 |
| Square | 266375041 |
| Cube | 4347507044161 |
| Square root | 127.753669 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 66 |
| Scientific notation | 1.6321 × |
16321 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand three hundred and twenty-one |
| Binary (base 2) | 11111111000001 |
| Octal (base 8) | 37701 |
| Hexadecimal (base 16) | 3FC1 |
| Base 3 | 211101111 |
| As time | 16321 seconds = 4 h 32 min 1 s |
Is 16321 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 | No (remainder 1) | 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 4) | 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 16321 a prime number?
No. 16321 = 19 × 859, so it is divisible by 19.
What are the factors of 16321?
1, 19, 859, 16321.
What is 16321 in binary?
11111111000001 (hexadecimal 3FC1, octal 37701).
What is the square root of 16321?
About 127.7537.
Is 16321 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 16321?
16321 is a semiprime: 19 × 859, the product of two primes.