The number 83021
83021 is a composite number with 4 divisors. Its prime factorisation is 61 × 1361. Divisors (4): 1, 61, 1361, 83021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 83021: a semiprime: 61 × 1361, the product of two primes.
- 2
83021 is composite. Its prime factorisation is
- 3
The divisors add up to 84444; without 83021 itself that is 1423, so 83021 is deficient (1423 is less than 83021). Euler's totient φ(83021) = 81600 numbers up to 83021 share no factor with it.
- 4
The digits of 83021 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 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 83021 = 61 \times 1361 \]
83021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 84444 |
| Euler totient φ(n) | 81600 |
| Square | 6892486441 |
| Cube | 572221116818261 |
| Square root | 288.133650 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 89 |
| Scientific notation | 8.3021 × |
83021 in other forms
| Form | Value |
|---|---|
| In words | eighty-three thousand and twenty-one |
| Binary (base 2) | 10100010001001101 |
| Octal (base 8) | 242115 |
| Hexadecimal (base 16) | 1444D |
| Base 3 | 11012212212 |
| As time | 83021 seconds = 23 h 3 min 41 s |
Is 83021 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 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 83021 a prime number?
No. 83021 = 61 × 1361, so it is divisible by 61.
What are the factors of 83021?
1, 61, 1361, 83021.
What is 83021 in binary?
10100010001001101 (hexadecimal 1444D, octal 242115).
What is the square root of 83021?
About 288.1336.
Is 83021 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 83021?
83021 is a semiprime: 61 × 1361, the product of two primes.