21216

21,216 is an even composite number composed of four prime numbers multiplied together.

What does the number 21216 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 48 divisors.

21216 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 21216:

2⁵ × 3 × 13 × 17

(2 × 2 × 2 × 2 × 2 × 3 × 13 × 17)

See below for interesting mathematical facts about the number 21216 from the Numbermatics database.

Names of 21216

Cardinal: 21216 can be written as Twenty-one thousand, two hundred sixteen.

Scientific notation

Scientific notation: 2.1216 × 10⁴

Factors of 21216

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 8
Sum of prime factors: 35

Divisors of 21216

Number of divisors d(n): 48
Complete list of divisors:
1 2 3 4 6 8 12 13 16 17 24 26 32 34 39 48 51 52 68 78 96 102 104 136 156 204 208 221 272 312 408 416 442 544 624 663 816 884 1248 1326 1632 1768 2652 3536 5304 7072 10608 21216
Sum of all divisors σ(n): 63504
Sum of proper divisors (its aliquot sum) s(n): 42288
21216 is an abundant number, because the sum of its proper divisors (42288) is greater than itself. Its abundance is 21072

Bases of 21216

Binary: 101001011100000₂
Hexadecimal: 0x52E0
Base-36: GDC

Squares and roots of 21216

21216 squared (21216²) is 450118656
21216 cubed (21216³) is 9549717405696
The square root of 21216 is 145.6571316483
The cube root of 21216 is 27.6835109761

Scales and comparisons

How big is 21216?

21,216 seconds is equal to 5 hours, 53 minutes, 36 seconds.
To count from 1 to 21,216 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 21216 cubic inches would be around 2.3 feet tall.

Recreational maths with 21216

21216 backwards is 61212
21216 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 21216's digits is 12
More coming soon!

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The information we have on file for 21216 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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