The number 42122
42122 is a composite number with 4 divisors. Its prime factorisation is 2 × 21061. Divisors (4): 1, 2, 21061, 42122.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42122: a semiprime: 2 × 21061, the product of two primes.
- 2
42122 is composite. Its prime factorisation is
- 3
The divisors add up to 63186; without 42122 itself that is 21064, so 42122 is deficient (21064 is less than 42122). Euler's totient φ(42122) = 21060 numbers up to 42122 share no factor with it.
- 4
The digits of 42122 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 44 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42122 = 2 \times 21061 \]
42122 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63186 |
| Euler totient φ(n) | 21060 |
| Square | 1774262884 |
| Cube | 74735501199848 |
| Square root | 205.236449 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 44 |
| Scientific notation | 4.2122 × |
42122 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and twenty-two |
| Binary (base 2) | 1010010010001010 |
| Octal (base 8) | 122212 |
| Hexadecimal (base 16) | A48A |
| Base 3 | 2010210002 |
| As time | 42122 seconds = 11 h 42 min 2 s |
Is 42122 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42122 ÷ 2 = 21061) | 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 2) | 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 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 2) | 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 2) | 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 42122 a prime number?
No. 42122 = 2 × 21061, so it is divisible by 2.
What are the factors of 42122?
1, 2, 21061, 42122.
What is 42122 in binary?
1010010010001010 (hexadecimal A48A, octal 122212).
What is the square root of 42122?
About 205.2364.
Is 42122 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 42122?
42122 is a semiprime: 2 × 21061, the product of two primes.