The number 10421
10421 is a composite number with 4 divisors. Its prime factorisation is 17 × 613. Divisors (4): 1, 17, 613, 10421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 10421: a semiprime: 17 × 613, the product of two primes.
- 2
10421 is composite. Its prime factorisation is
- 3
The divisors add up to 11052; without 10421 itself that is 631, so 10421 is deficient (631 is less than 10421). Euler's totient φ(10421) = 9792 numbers up to 10421 share no factor with it.
- 4
The digits of 10421 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 104 steps to reach 1.
LaTeX source of the formulas on this page
\[ 10421 = 17 \times 613 \]
10421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 11052 |
| Euler totient φ(n) | 9792 |
| Square | 108597241 |
| Cube | 1131691848461 |
| Square root | 102.083299 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 104 |
| Scientific notation | 1.0421 × |
10421 in other forms
| Form | Value |
|---|---|
| In words | ten thousand four hundred and twenty-one |
| Binary (base 2) | 10100010110101 |
| Octal (base 8) | 24265 |
| Hexadecimal (base 16) | 28B5 |
| Base 3 | 112021222 |
| As time | 10421 seconds = 2 h 53 min 41 s |
Is 10421 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 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 8) | 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 4) | 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 10421 a prime number?
No. 10421 = 17 × 613, so it is divisible by 17.
What are the factors of 10421?
1, 17, 613, 10421.
What is 10421 in binary?
10100010110101 (hexadecimal 28B5, octal 24265).
What is the square root of 10421?
About 102.0833.
Is 10421 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 10421?
10421 is a semiprime: 17 × 613, the product of two primes.