The number 21498
21498 is a composite number with 8 divisors. Its prime factorisation is 2 × 3 × 3583. Divisors (8): 1, 2, 3, 6, 3583, 7166, 10749, 21498.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21498 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21498 is composite. Its prime factorisation is
- 3
The divisors add up to 43008; without 21498 itself that is 21510, so 21498 is abundant (21510 is more than 21498). Euler's totient φ(21498) = 7164 numbers up to 21498 share no factor with it.
- 4
The digits of 21498 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 100 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21498 = 2 \times 3 \times 3583 \]
21498 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 43008 |
| Euler totient φ(n) | 7164 |
| Square | 462164004 |
| Cube | 9935601757992 |
| Square root | 146.621963 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 100 |
| Scientific notation | 2.1498 × |
21498 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand four hundred and ninety-eight |
| Binary (base 2) | 101001111111010 |
| Octal (base 8) | 51772 |
| Hexadecimal (base 16) | 53FA |
| Base 3 | 1002111020 |
| As time | 21498 seconds = 5 h 58 min 18 s |
Is 21498 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21498 ÷ 2 = 10749) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (21498 ÷ 3 = 7166) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | 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 | Yes (21498 ÷ 6 = 3583) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21498 a prime number?
No. 21498 = 2 × 3 × 3583, so it is divisible by 2.
What are the factors of 21498?
1, 2, 3, 6, 3583, 7166, 10749, 21498.
What is 21498 in binary?
101001111111010 (hexadecimal 53FA, octal 51772).
What is the square root of 21498?
About 146.6220.
Is 21498 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 21498?
It is a composite number with 8 divisors.