21390 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of thirty-two divisors.
Prime factorization of 21390:
2 × 3 × 5 × 23 × 31
See below for interesting mathematical facts about the number 21390 from the Numbermatics database.
Names of 21390
- Cardinal: 21390 can be written as Twenty-one thousand, three hundred ninety.
- Scientific notation: 2.139 × 104
Factors of 21390
Divisors of 21390
Bases of 21390
- Binary: 1010011100011102
- Hexadecimal: 0x538E
- Base-36: GI6
Squares and roots of 21390
Scales and comparisonsHow big is 21390?
- 21,390 seconds is equal to 5 hours, 56 minutes, 30 seconds.
To count from 1 to 21,390 would take you about five 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 21390 cubic inches would be around 2.3 feet tall.
Recreational maths with 21390
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"Number 21390 - Facts about the integer". Numbermatics.com. 2021. Web. 12 May 2021.
Numbermatics. (2021). Number 21390 - Facts about the integer. Retrieved 12 May 2021, from https://numbermatics.com/n/21390/
Numbermatics. 2021. "Number 21390 - Facts about the integer". https://numbermatics.com/n/21390/
The information we have on file for 21390 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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