The number 33221
33221 is a composite number with 4 divisors. Its prime factorisation is 139 × 239. Divisors (4): 1, 139, 239, 33221.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 33221: a semiprime: 139 × 239, the product of two primes.
- 2
33221 is composite. Its prime factorisation is
- 3
The divisors add up to 33600; without 33221 itself that is 379, so 33221 is deficient (379 is less than 33221). Euler's totient φ(33221) = 32844 numbers up to 33221 share no factor with it.
- 4
The digits of 33221 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 129 steps to reach 1.
LaTeX source of the formulas on this page
\[ 33221 = 139 \times 239 \]
33221 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 33600 |
| Euler totient φ(n) | 32844 |
| Square | 1103634841 |
| Cube | 36663853052861 |
| Square root | 182.266289 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 129 |
| Scientific notation | 3.3221 × |
33221 in other forms
| Form | Value |
|---|---|
| In words | thirty-three thousand two hundred and twenty-one |
| Binary (base 2) | 1000000111000101 |
| Octal (base 8) | 100705 |
| Hexadecimal (base 16) | 81C5 |
| Base 3 | 1200120102 |
| As time | 33221 seconds = 9 h 13 min 41 s |
Is 33221 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 2) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 33221 a prime number?
No. 33221 = 139 × 239, so it is divisible by 139.
What are the factors of 33221?
1, 139, 239, 33221.
What is 33221 in binary?
1000000111000101 (hexadecimal 81C5, octal 100705).
What is the square root of 33221?
About 182.2663.
Is 33221 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 33221?
33221 is a semiprime: 139 × 239, the product of two primes.