The number 16121
16121 is a composite number with 8 divisors. Its prime factorisation is Ć 47. Divisors (8): 1, 7, 47, 49, 329, 343, 2303, 16121.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16121 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16121 is composite. Its prime factorisation is
- 3
The divisors add up to 19200; without 16121 itself that is 3079, so 16121 is deficient (3079 is less than 16121). Euler's totient Ļ(16121) = 13524 numbers up to 16121 share no factor with it.
- 4
The digits of 16121 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 97 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16121 = 7^{3} \times 47 \]16121 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 19200 |
| Euler totient Ļ(n) | 13524 |
| Square | 259886641 |
| Cube | 4189632539561 |
| Square root | 126.968500 (= 7ā329) |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 97 |
| Scientific notation | 1.6121 Ć |
16121 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand one hundred and twenty-one |
| Binary (base 2) | 11111011111001 |
| Octal (base 8) | 37371 |
| Hexadecimal (base 16) | 3EF9 |
| Base 3 | 211010002 |
| As time | 16121 seconds = 4 h 28 min 41 s |
Is 16121 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (16121 Ć· 7 = 2303) | 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16121 a prime number?
No. 16121 = Ć 47, so it is divisible by 7.
What are the factors of 16121?
1, 7, 47, 49, 329, 343, 2303, 16121.
What is 16121 in binary?
11111011111001 (hexadecimal 3EF9, octal 37371).
What is the square root of 16121?
About 126.9685, exactly 7ā329.
Is 16121 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 16121?
It is a composite number with 8 divisors.