The number 42421
42421 is a composite number with 4 divisors. Its prime factorisation is 59 × 719. Divisors (4): 1, 59, 719, 42421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42421: a semiprime: 59 × 719, the product of two primes.
- 2
42421 is composite. Its prime factorisation is
- 3
The divisors add up to 43200; without 42421 itself that is 779, so 42421 is deficient (779 is less than 42421). Euler's totient φ(42421) = 41644 numbers up to 42421 share no factor with it.
- 4
The digits of 42421 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 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42421 = 59 \times 719 \]
42421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43200 |
| Euler totient φ(n) | 41644 |
| Square | 1799541241 |
| Cube | 76338338984461 |
| Square root | 205.963589 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.2421 × |
42421 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and twenty-one |
| Binary (base 2) | 1010010110110101 |
| Octal (base 8) | 122665 |
| Hexadecimal (base 16) | A5B5 |
| Base 3 | 2011012011 |
| As time | 42421 seconds = 11 h 47 min 1 s |
Is 42421 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 1) | 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 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 5) | 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 42421 a prime number?
No. 42421 = 59 × 719, so it is divisible by 59.
What are the factors of 42421?
1, 59, 719, 42421.
What is 42421 in binary?
1010010110110101 (hexadecimal A5B5, octal 122665).
What is the square root of 42421?
About 205.9636.
Is 42421 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 42421?
42421 is a semiprime: 59 × 719, the product of two primes.