21845 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.
Prime factorization of 21845:
5 × 17 × 257
See below for interesting mathematical facts about the number 21845 from the Numbermatics database.
Names of 21845
- Cardinal: 21845 can be written as Twenty-one thousand, eight hundred forty-five.
- Scientific notation: 2.1845 × 104
Factors of 21845
Divisors of 21845
Bases of 21845
- Binary: 1010101010101012
- Hexadecimal: 0x5555
- Base-36: GUT
Squares and roots of 21845
Scales and comparisonsHow big is 21845?
- 21,845 seconds is equal to 6 hours, 4 minutes, 5 seconds.
To count from 1 to 21,845 would take you about six hours.
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 21845 cubic inches would be around 2.3 feet tall.
Recreational maths with 21845
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Cite this page
"Number 21845 - Facts about the integer". Numbermatics.com. 2023. Web. 9 December 2023.
Numbermatics. (2023). Number 21845 - Facts about the integer. Retrieved 9 December 2023, from https://numbermatics.com/n/21845/
Numbermatics. 2023. "Number 21845 - Facts about the integer". https://numbermatics.com/n/21845/
The information we have on file for 21845 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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