21355

21,355 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21355 look like?

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

21355 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 21355:

5 × 4271

See below for interesting mathematical facts about the number 21355 from the Numbermatics database.

Names of 21355

• Cardinal: 21355 can be written as Twenty-one thousand, three hundred fifty-five.

Scientific notation

• Scientific notation: 2.1355 × 104

Factors of 21355

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 4276

Divisors of 21355

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 25632
• Sum of proper divisors (its aliquot sum) s(n): 4277
• 21355 is a deficient number, because the sum of its proper divisors (4277) is less than itself. Its deficiency is 17078

Bases of 21355

• Binary: 1010011011010112
• Base-36: GH7

Squares and roots of 21355

• 21355 squared (213552) is 456036025
• 21355 cubed (213553) is 9738649313875
• The square root of 21355 is 146.1335006081
• The cube root of 21355 is 27.7438370645

Scales and comparisons

How big is 21355?
• 21,355 seconds is equal to 5 hours, 55 minutes, 55 seconds.
• To count from 1 to 21,355 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 21355 cubic inches would be around 2.3 feet tall.

Recreational maths with 21355

• 21355 backwards is 55312
• The number of decimal digits it has is: 5
• The sum of 21355's digits is 16
• More coming soon!

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"Number 21355 - Facts about the integer". Numbermatics.com. 2022. Web. 20 January 2022.

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Numbermatics. (2022). Number 21355 - Facts about the integer. Retrieved 20 January 2022, from https://numbermatics.com/n/21355/

Chicago style:
Numbermatics. 2022. "Number 21355 - Facts about the integer". https://numbermatics.com/n/21355/

The information we have on file for 21355 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!

Keywords: Divisors of 21355, math, Factors of 21355, curriculum, school, college, exams, university, Prime factorization of 21355, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, three hundred fifty-five.

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