The number 27021
27021 is a composite number with 4 divisors. Its prime factorisation is 3 × 9007. Divisors (4): 1, 3, 9007, 27021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27021: a semiprime: 3 × 9007, the product of two primes.
- 2
27021 is composite. Its prime factorisation is
- 3
The divisors add up to 36032; without 27021 itself that is 9011, so 27021 is deficient (9011 is less than 27021). Euler's totient φ(27021) = 18012 numbers up to 27021 share no factor with it.
- 4
The digits of 27021 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 38 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27021 = 3 \times 9007 \]
27021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 36032 |
| Euler totient φ(n) | 18012 |
| Square | 730134441 |
| Cube | 19728962730261 |
| Square root | 164.380656 |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 38 |
| Scientific notation | 2.7021 × |
27021 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand and twenty-one |
| Binary (base 2) | 110100110001101 |
| Octal (base 8) | 64615 |
| Hexadecimal (base 16) | 698D |
| Base 3 | 1101001210 |
| As time | 27021 seconds = 7 h 30 min 21 s |
Is 27021 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 | Yes (27021 ÷ 3 = 9007) | 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 3) | 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 3) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27021 a prime number?
No. 27021 = 3 × 9007, so it is divisible by 3.
What are the factors of 27021?
1, 3, 9007, 27021.
What is 27021 in binary?
110100110001101 (hexadecimal 698D, octal 64615).
What is the square root of 27021?
About 164.3807.
Is 27021 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 27021?
27021 is a semiprime: 3 × 9007, the product of two primes.