The number 21094
21094 is a composite number with 8 divisors. Its prime factorisation is 2 × 53 × 199. Divisors (8): 1, 2, 53, 106, 199, 398, 10547, 21094.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21094 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21094 is composite. Its prime factorisation is
- 3
The divisors add up to 32400; without 21094 itself that is 11306, so 21094 is deficient (11306 is less than 21094). Euler's totient φ(21094) = 10296 numbers up to 21094 share no factor with it.
- 4
The digits of 21094 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 149 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21094 = 2 \times 53 \times 199 \]
21094 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 32400 |
| Euler totient φ(n) | 10296 |
| Square | 444956836 |
| Cube | 9385919498584 |
| Square root | 145.237736 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 149 |
| Scientific notation | 2.1094 × |
21094 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand and ninety-four |
| Binary (base 2) | 101001001100110 |
| Octal (base 8) | 51146 |
| Hexadecimal (base 16) | 5266 |
| Base 3 | 1001221021 |
| As time | 21094 seconds = 5 h 51 min 34 s |
Is 21094 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21094 ÷ 2 = 10547) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21094 a prime number?
No. 21094 = 2 × 53 × 199, so it is divisible by 2.
What are the factors of 21094?
1, 2, 53, 106, 199, 398, 10547, 21094.
What is 21094 in binary?
101001001100110 (hexadecimal 5266, octal 51146).
What is the square root of 21094?
About 145.2377.
Is 21094 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 21094?
It is a composite number with 8 divisors.