The number 21410
21410 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 2141. Divisors (8): 1, 2, 5, 10, 2141, 4282, 10705, 21410.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
21410 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
21410 is composite. Its prime factorisation is
- 3
The divisors add up to 38556; without 21410 itself that is 17146, so 21410 is deficient (17146 is less than 21410). Euler's totient φ(21410) = 8560 numbers up to 21410 share no factor with it.
- 4
The digits of 21410 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 48 steps to reach 1.
LaTeX source of the formulas on this page
\[ 21410 = 2 \times 5 \times 2141 \]
21410 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 38556 |
| Euler totient φ(n) | 8560 |
| Square | 458388100 |
| Cube | 9814089221000 |
| Square root | 146.321564 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 48 |
| Scientific notation | 2.141 × |
21410 in other forms
| Form | Value |
|---|---|
| In words | twenty-one thousand four hundred and ten |
| Binary (base 2) | 101001110100010 |
| Octal (base 8) | 51642 |
| Hexadecimal (base 16) | 53A2 |
| Base 3 | 1002100222 |
| As time | 21410 seconds = 5 h 56 min 50 s |
Is 21410 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (21410 ÷ 2 = 10705) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (21410 ÷ 5 = 4282) | 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 4) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (21410 ÷ 10 = 2141) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 21410 a prime number?
No. 21410 = 2 × 5 × 2141, so it is divisible by 2.
What are the factors of 21410?
1, 2, 5, 10, 2141, 4282, 10705, 21410.
What is 21410 in binary?
101001110100010 (hexadecimal 53A2, octal 51642).
What is the square root of 21410?
About 146.3216.
Is 21410 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 21410?
It is a composite number with 8 divisors.