The number 70021
70021 is a composite number with 6 divisors. Its prime factorisation is Ć 1429. Divisors (6): 1, 7, 49, 1429, 10003, 70021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
70021 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
70021 is composite. Its prime factorisation is
- 3
The divisors add up to 81510; without 70021 itself that is 11489, so 70021 is deficient (11489 is less than 70021). Euler's totient Ļ(70021) = 59976 numbers up to 70021 share no factor with it.
- 4
The digits of 70021 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 81 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70021 = 7^{2} \times 1429 \]70021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 81510 |
| Euler totient Ļ(n) | 59976 |
| Square | 4902940441 |
| Cube | 343308792619261 |
| Square root | 264.614814 (= 7ā1429) |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 81 |
| Scientific notation | 7.0021 Ć |
70021 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand and twenty-one |
| Binary (base 2) | 10001000110000101 |
| Octal (base 8) | 210605 |
| Hexadecimal (base 16) | 11185 |
| Base 3 | 10120001101 |
| As time | 70021 seconds = 19 h 27 min 1 s |
Is 70021 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 | Yes (70021 Ć· 7 = 10003) | 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 1) | 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 6) | 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 70021 a prime number?
No. 70021 = Ć 1429, so it is divisible by 7.
What are the factors of 70021?
1, 7, 49, 1429, 10003, 70021.
What is 70021 in binary?
10001000110000101 (hexadecimal 11185, octal 210605).
What is the square root of 70021?
About 264.6148, exactly 7ā1429.
Is 70021 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 70021?
It is a composite number with 6 divisors.