The number 21246
21246 is a composite number with 8 divisors. Its prime factorisation is 2 × 3 × 3541. Divisors (8): 1, 2, 3, 6, 3541, 7082, 10623, 21246.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21246 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21246 is composite. Its prime factorisation is
- 3
The divisors add up to 42504; without 21246 itself that is 21258, so 21246 is abundant (21258 is more than 21246). Euler's totient φ(21246) = 7080 numbers up to 21246 share no factor with it.
- 4
The digits of 21246 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 100 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21246 = 2 \times 3 \times 3541 \]
21246 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 42504 |
| Euler totient φ(n) | 7080 |
| Square | 451392516 |
| Cube | 9590285394936 |
| Square root | 145.760077 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 100 |
| Scientific notation | 2.1246 × |
21246 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand two hundred and forty-six |
| Binary (base 2) | 101001011111110 |
| Octal (base 8) | 51376 |
| Hexadecimal (base 16) | 52FE |
| Base 3 | 1002010220 |
| As time | 21246 seconds = 5 h 54 min 6 s |
Is 21246 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21246 ÷ 2 = 10623) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (21246 ÷ 3 = 7082) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | 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 | Yes (21246 ÷ 6 = 3541) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | 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 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21246 a prime number?
No. 21246 = 2 × 3 × 3541, so it is divisible by 2.
What are the factors of 21246?
1, 2, 3, 6, 3541, 7082, 10623, 21246.
What is 21246 in binary?
101001011111110 (hexadecimal 52FE, octal 51376).
What is the square root of 21246?
About 145.7601.
Is 21246 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 21246?
It is a composite number with 8 divisors.