221 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.
Prime factorization of 221:
13 × 17
See below for interesting mathematical facts about the number 221 from the Numbermatics database.
Names of 221
- Cardinal: 221 can be written as Two hundred twenty-one.
- Scientific notation: 2.21 × 102
Factors of 221
Divisors of 221
Bases of 221
- Binary: 110111012
- Hexadecimal: 0xDD
- Base-36: 65
Squares and roots of 221
Scales and comparisonsHow big is 221?
- 221 seconds is equal to 3 minutes, 41 seconds.
To count from 1 to 221 would take you about fifty seconds.
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 221 cubic inches would be around 0.5 feet tall.
Recreational maths with 221
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Cite this page
"Number 221 - Facts about the integer". Numbermatics.com. 2020. Web. 30 November 2020.
Numbermatics. (2020). Number 221 - Facts about the integer. Retrieved 30 November 2020, from https://numbermatics.com/n/221/
Numbermatics. 2020. "Number 221 - Facts about the integer". https://numbermatics.com/n/221/
The information we have on file for 221 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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