The number 80421
80421 is a composite number with 8 divisors. Its prime factorisation is 3 × 11 × 2437. Divisors (8): 1, 3, 11, 33, 2437, 7311, 26807, 80421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
80421 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
80421 is composite. Its prime factorisation is
- 3
The divisors add up to 117024; without 80421 itself that is 36603, so 80421 is deficient (36603 is less than 80421). Euler's totient φ(80421) = 48720 numbers up to 80421 share no factor with it.
- 4
The digits of 80421 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 107 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80421 = 3 \times 11 \times 2437 \]
80421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 117024 |
| Euler totient φ(n) | 48720 |
| Square | 6467537241 |
| Cube | 520125812458461 |
| Square root | 283.585966 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 107 |
| Scientific notation | 8.0421 × |
80421 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand four hundred and twenty-one |
| Binary (base 2) | 10011101000100101 |
| Octal (base 8) | 235045 |
| Hexadecimal (base 16) | 13A25 |
| Base 3 | 11002022120 |
| As time | 80421 seconds = 22 h 20 min 21 s |
Is 80421 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 (80421 ÷ 3 = 26807) | 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 | Yes (80421 ÷ 11 = 7311) | 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 80421 a prime number?
No. 80421 = 3 × 11 × 2437, so it is divisible by 3.
What are the factors of 80421?
1, 3, 11, 33, 2437, 7311, 26807, 80421.
What is 80421 in binary?
10011101000100101 (hexadecimal 13A25, octal 235045).
What is the square root of 80421?
About 283.5860.
Is 80421 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 80421?
It is a composite number with 8 divisors.