The number 27421
27421 is a composite number with 4 divisors. Its prime factorisation is 17 × 1613. Divisors (4): 1, 17, 1613, 27421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27421: a semiprime: 17 × 1613, the product of two primes.
- 2
27421 is composite. Its prime factorisation is
- 3
The divisors add up to 29052; without 27421 itself that is 1631, so 27421 is deficient (1631 is less than 27421). Euler's totient φ(27421) = 25792 numbers up to 27421 share no factor with it.
- 4
The digits of 27421 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 90 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27421 = 17 \times 1613 \]
27421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 29052 |
| Euler totient φ(n) | 25792 |
| Square | 751911241 |
| Cube | 20618158139461 |
| Square root | 165.592874 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 90 |
| Scientific notation | 2.7421 × |
27421 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand four hundred and twenty-one |
| Binary (base 2) | 110101100011101 |
| Octal (base 8) | 65435 |
| Hexadecimal (base 16) | 6B1D |
| Base 3 | 1101121121 |
| As time | 27421 seconds = 7 h 37 min 1 s |
Is 27421 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 | No (remainder 2) | 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 7) | 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 9) | 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 27421 a prime number?
No. 27421 = 17 × 1613, so it is divisible by 17.
What are the factors of 27421?
1, 17, 1613, 27421.
What is 27421 in binary?
110101100011101 (hexadecimal 6B1D, octal 65435).
What is the square root of 27421?
About 165.5929.
Is 27421 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 27421?
27421 is a semiprime: 17 × 1613, the product of two primes.