221

221 is an odd composite number composed of two prime numbers multiplied together.

What does the number 221 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

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

Scientific notation: 2.21 × 10²

Factors of 221

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 30

Divisors of 221

Number of divisors d(n): 4
Complete list of divisors:
1 13 17 221
Sum of all divisors σ(n): 252
Sum of proper divisors (its aliquot sum) s(n): 31
221 is a deficient number, because the sum of its proper divisors (31) is less than itself. Its deficiency is 190

Bases of 221

Binary: 11011101₂
Hexadecimal: 0xDD
Base-36: 65

Squares and roots of 221

221 squared (221²) is 48841
221 cubed (221³) is 10793861
The square root of 221 is 14.8660687473
The cube root of 221 is 6.0459435961

Scales and comparisons

How 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

221 backwards is 122
The number of decimal digits it has is: 3
The sum of 221's digits is 5
More coming soon!

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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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