The number 26421
26421 is a composite number with 4 divisors. Its prime factorisation is 3 × 8807. Divisors (4): 1, 3, 8807, 26421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 26421: a semiprime: 3 × 8807, the product of two primes.
- 2
26421 is composite. Its prime factorisation is
- 3
The divisors add up to 35232; without 26421 itself that is 8811, so 26421 is deficient (8811 is less than 26421). Euler's totient φ(26421) = 17612 numbers up to 26421 share no factor with it.
- 4
The digits of 26421 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 139 steps to reach 1.
LaTeX source of the formulas on this page
\[ 26421 = 3 \times 8807 \]
26421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 35232 |
| Euler totient φ(n) | 17612 |
| Square | 698069241 |
| Cube | 18443687416461 |
| Square root | 162.545378 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 139 |
| Scientific notation | 2.6421 × |
26421 in other forms
| Form | Value |
|---|---|
| In words | twenty-six thousand four hundred and twenty-one |
| Binary (base 2) | 110011100110101 |
| Octal (base 8) | 63465 |
| Hexadecimal (base 16) | 6735 |
| Base 3 | 1100020120 |
| As time | 26421 seconds = 7 h 20 min 21 s |
Is 26421 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 | Yes (26421 ÷ 3 = 8807) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 5) | 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 1) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 26421 a prime number?
No. 26421 = 3 × 8807, so it is divisible by 3.
What are the factors of 26421?
1, 3, 8807, 26421.
What is 26421 in binary?
110011100110101 (hexadecimal 6735, octal 63465).
What is the square root of 26421?
About 162.5454.
Is 26421 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 26421?
26421 is a semiprime: 3 × 8807, the product of two primes.