The number 55221
55221 is a composite number with 8 divisors. Its prime factorisation is 3 × 79 × 233. Divisors (8): 1, 3, 79, 233, 237, 699, 18407, 55221.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
55221 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
55221 is composite. Its prime factorisation is
- 3
The divisors add up to 74880; without 55221 itself that is 19659, so 55221 is deficient (19659 is less than 55221). Euler's totient φ(55221) = 36192 numbers up to 55221 share no factor with it.
- 4
The digits of 55221 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 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55221 = 3 \times 79 \times 233 \]
55221 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 74880 |
| Euler totient φ(n) | 36192 |
| Square | 3049358841 |
| Cube | 168388644558861 |
| Square root | 234.991489 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 60 |
| Scientific notation | 5.5221 × |
55221 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand two hundred and twenty-one |
| Binary (base 2) | 1101011110110101 |
| Octal (base 8) | 153665 |
| Hexadecimal (base 16) | D7B5 |
| Base 3 | 2210202020 |
| As time | 55221 seconds = 15 h 20 min 21 s |
Is 55221 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 (55221 ÷ 3 = 18407) | 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 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 5) | 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 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55221 a prime number?
No. 55221 = 3 × 79 × 233, so it is divisible by 3.
What are the factors of 55221?
1, 3, 79, 233, 237, 699, 18407, 55221.
What is 55221 in binary?
1101011110110101 (hexadecimal D7B5, octal 153665).
What is the square root of 55221?
About 234.9915.
Is 55221 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 55221?
It is a composite number with 8 divisors.