The number 21134
21134 is a composite number with 4 divisors. Its prime factorisation is 2 × 10567. Divisors (4): 1, 2, 10567, 21134.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 21134: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 10567, the product of two primes.
- 2
21134 is composite. Its prime factorisation is
- 3
The divisors add up to 31704; without 21134 itself that is 10570, so 21134 is deficient (10570 is less than 21134). Euler's totient φ(21134) = 10566 numbers up to 21134 share no factor with it.
- 4
The digits of 21134 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 61 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21134 = 2 \times 10567 \]
21134 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 31704 |
| Euler totient φ(n) | 10566 |
| Square | 446645956 |
| Cube | 9439415634104 |
| Square root | 145.375376 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 61 |
| Scientific notation | 2.1134 × |
21134 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand one hundred and thirty-four |
| Binary (base 2) | 101001010001110 |
| Octal (base 8) | 51216 |
| Hexadecimal (base 16) | 528E |
| Base 3 | 1001222202 |
| As time | 21134 seconds = 5 h 52 min 14 s |
Is 21134 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21134 ÷ 2 = 10567) | 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 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 2) | 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 2) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21134 a prime number?
No. 21134 = 2 × 10567, so it is divisible by 2.
What are the factors of 21134?
1, 2, 10567, 21134.
What is 21134 in binary?
101001010001110 (hexadecimal 528E, octal 51216).
What is the square root of 21134?
About 145.3754.
Is 21134 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 21134?
21134 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 10567, the product of two primes.