21551

21,551 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21551 look like?

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

21551 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 21551:

23 × 937

See below for interesting mathematical facts about the number 21551 from the Numbermatics database.

Names of 21551

Cardinal: 21551 can be written as Twenty-one thousand, five hundred fifty-one.

Scientific notation

Scientific notation: 2.1551 × 10⁴

Factors of 21551

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 960

Divisors of 21551

Number of divisors d(n): 4
Complete list of divisors:
1 23 937 21551
Sum of all divisors σ(n): 22512
Sum of proper divisors (its aliquot sum) s(n): 961
21551 is a deficient number, because the sum of its proper divisors (961) is less than itself. Its deficiency is 20590

Bases of 21551

Binary: 101010000101111₂
Hexadecimal: 0x542F
Base-36: GMN

Squares and roots of 21551

21551 squared (21551²) is 464445601
21551 cubed (21551³) is 10009267147151
The square root of 21551 is 146.8025885331
The cube root of 21551 is 27.8284579969

Scales and comparisons

How big is 21551?

21,551 seconds is equal to 5 hours, 59 minutes, 11 seconds.
To count from 1 to 21,551 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 21551 cubic inches would be around 2.3 feet tall.

Recreational maths with 21551

21551 backwards is 15512
The number of decimal digits it has is: 5
The sum of 21551's digits is 14
More coming soon!

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The information we have on file for 21551 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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