The number 70421
70421 is a composite number with 4 divisors. Its prime factorisation is 13 × 5417. Divisors (4): 1, 13, 5417, 70421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 70421: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 5417, the product of two primes.
- 2
70421 is composite. Its prime factorisation is
- 3
The divisors add up to 75852; without 70421 itself that is 5431, so 70421 is deficient (5431 is less than 70421). Euler's totient φ(70421) = 64992 numbers up to 70421 share no factor with it.
- 4
The digits of 70421 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 143 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70421 = 13 \times 5417 \]
70421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 75852 |
| Euler totient φ(n) | 64992 |
| Square | 4959117241 |
| Cube | 349225995228461 |
| Square root | 265.369554 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 143 |
| Scientific notation | 7.0421 × |
70421 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand four hundred and twenty-one |
| Binary (base 2) | 10001001100010101 |
| Octal (base 8) | 211425 |
| Hexadecimal (base 16) | 11315 |
| Base 3 | 10120121012 |
| As time | 70421 seconds = 19 h 33 min 41 s |
Is 70421 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 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 5) | 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 10) | 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 70421 a prime number?
No. 70421 = 13 × 5417, so it is divisible by 13.
What are the factors of 70421?
1, 13, 5417, 70421.
What is 70421 in binary?
10001001100010101 (hexadecimal 11315, octal 211425).
What is the square root of 70421?
About 265.3696.
Is 70421 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 70421?
70421 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 5417, the product of two primes.