The number 16021
16021 is a composite number with 4 divisors. Its prime factorisation is 37 × 433. Divisors (4): 1, 37, 433, 16021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16021: a semiprime: 37 × 433, the product of two primes.
- 2
16021 is composite. Its prime factorisation is
- 3
The divisors add up to 16492; without 16021 itself that is 471, so 16021 is deficient (471 is less than 16021). Euler's totient φ(16021) = 15552 numbers up to 16021 share no factor with it.
- 4
The digits of 16021 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 146 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16021 = 37 \times 433 \]
16021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 16492 |
| Euler totient φ(n) | 15552 |
| Square | 256672441 |
| Cube | 4112149177261 |
| Square root | 126.574089 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 146 |
| Scientific notation | 1.6021 × |
16021 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand and twenty-one |
| Binary (base 2) | 11111010010101 |
| Octal (base 8) | 37225 |
| Hexadecimal (base 16) | 3E95 |
| Base 3 | 210222101 |
| As time | 16021 seconds = 4 h 27 min 1 s |
Is 16021 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 5) | 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 | No (remainder 5) | 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 16021 a prime number?
No. 16021 = 37 × 433, so it is divisible by 37.
What are the factors of 16021?
1, 37, 433, 16021.
What is 16021 in binary?
11111010010101 (hexadecimal 3E95, octal 37225).
What is the square root of 16021?
About 126.5741.
Is 16021 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 16021?
16021 is a semiprime: 37 × 433, the product of two primes.