The number 21448
21448 is a composite number with 16 divisors. Its prime factorisation is × 7 × 383. Divisors (16): 1, 2, 4, 7, 8, 14, 28, 56, 383, 766, 1532, 2681, 3064, 5362, 10724, 21448.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21448 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21448 is composite. Its prime factorisation is
- 3
The divisors add up to 46080; without 21448 itself that is 24632, so 21448 is abundant (24632 is more than 21448). Euler's totient φ(21448) = 9168 numbers up to 21448 share no factor with it.
- 4
The digits of 21448 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 48 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21448 = 2^{3} \times 7 \times 383 \]21448 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 46080 |
| Euler totient φ(n) | 9168 |
| Square | 460016704 |
| Cube | 9866438267392 |
| Square root | 146.451357 (= 2√5362) |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 48 |
| Scientific notation | 2.1448 × |
21448 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand four hundred and forty-eight |
| Binary (base 2) | 101001111001000 |
| Octal (base 8) | 51710 |
| Hexadecimal (base 16) | 53C8 |
| Base 3 | 1002102101 |
| As time | 21448 seconds = 5 h 57 min 28 s |
Is 21448 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21448 ÷ 2 = 10724) | 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 | Yes (21448 ÷ 4 = 5362) | 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 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (21448 ÷ 7 = 3064) | 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 | Yes (21448 ÷ 8 = 2681) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21448 a prime number?
No. 21448 = × 7 × 383, so it is divisible by 2.
What are the factors of 21448?
1, 2, 4, 7, 8, 14, 28, 56, 383, 766, 1532, 2681, 3064, 5362, 10724, 21448.
What is 21448 in binary?
101001111001000 (hexadecimal 53C8, octal 51710).
What is the square root of 21448?
About 146.4514, exactly 2√5362.
Is 21448 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 21448?
It is a composite number with 16 divisors.