The number 43021
43021 is a composite number with 4 divisors. Its prime factorisation is 11 × 3911. Divisors (4): 1, 11, 3911, 43021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 43021: a semiprime: 11 × 3911, the product of two primes.
- 2
43021 is composite. Its prime factorisation is
- 3
The divisors add up to 46944; without 43021 itself that is 3923, so 43021 is deficient (3923 is less than 43021). Euler's totient φ(43021) = 39100 numbers up to 43021 share no factor with it.
- 4
The digits of 43021 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 43021 = 11 \times 3911 \]
43021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46944 |
| Euler totient φ(n) | 39100 |
| Square | 1850806441 |
| Cube | 79623543898261 |
| Square root | 207.415043 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.3021 × |
43021 in other forms
| Form | Value |
|---|---|
| In words | forty-three thousand and twenty-one |
| Binary (base 2) | 1010100000001101 |
| Octal (base 8) | 124015 |
| Hexadecimal (base 16) | A80D |
| Base 3 | 2012000101 |
| As time | 43021 seconds = 11 h 57 min 1 s |
Is 43021 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 6) | 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 1) | 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 | Yes (43021 ÷ 11 = 3911) | 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 43021 a prime number?
No. 43021 = 11 × 3911, so it is divisible by 11.
What are the factors of 43021?
1, 11, 3911, 43021.
What is 43021 in binary?
1010100000001101 (hexadecimal A80D, octal 124015).
What is the square root of 43021?
About 207.4150.
Is 43021 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 43021?
43021 is a semiprime: 11 × 3911, the product of two primes.