The number 21548
21548 is a composite number with 6 divisors. Its prime factorisation is × 5387. Divisors (6): 1, 2, 4, 5387, 10774, 21548.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21548 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21548 is composite. Its prime factorisation is
- 3
The divisors add up to 37716; without 21548 itself that is 16168, so 21548 is deficient (16168 is less than 21548). Euler's totient φ(21548) = 10772 numbers up to 21548 share no factor with it.
- 4
The digits of 21548 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 149 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21548 = 2^{2} \times 5387 \]21548 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 37716 |
| Euler totient φ(n) | 10772 |
| Square | 464316304 |
| Cube | 10005087718592 |
| Square root | 146.792370 (= 2√5387) |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 149 |
| Scientific notation | 2.1548 × |
21548 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand five hundred and forty-eight |
| Binary (base 2) | 101010000101100 |
| Octal (base 8) | 52054 |
| Hexadecimal (base 16) | 542C |
| Base 3 | 1002120002 |
| As time | 21548 seconds = 5 h 59 min 8 s |
Is 21548 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21548 ÷ 2 = 10774) | 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 | Yes (21548 ÷ 4 = 5387) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | 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 2) | 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 4) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21548 a prime number?
No. 21548 = × 5387, so it is divisible by 2.
What are the factors of 21548?
1, 2, 4, 5387, 10774, 21548.
What is 21548 in binary?
101010000101100 (hexadecimal 542C, octal 52054).
What is the square root of 21548?
About 146.7924, exactly 2√5387.
Is 21548 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 21548?
It is a composite number with 6 divisors.