21391668

21,391,668 is an even composite number composed of four prime numbers multiplied together.

What does the number 21391668 look like?

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

21391668 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 21391668:

2² × 3³ × 41 × 4831

(2 × 2 × 3 × 3 × 3 × 41 × 4831)

See below for interesting mathematical facts about the number 21391668 from the Numbermatics database.

Names of 21391668

Cardinal: 21391668 can be written as Twenty-one million, three hundred ninety-one thousand, six hundred sixty-eight.

Scientific notation

Scientific notation: 2.1391668 × 10⁷

Factors of 21391668

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 7
Sum of prime factors: 4877

Divisors of 21391668

Number of divisors d(n): 48
Complete list of divisors:
1 2 3 4 6 9 12 18 27 36 41 54 82 108 123 164 246 369 492 738 1107 1476 2214 4428 4831 9662 14493 19324 28986 43479 57972 86958 130437 173916 198071 260874 396142 521748 594213 792284 1188426 1782639 2376852 3565278 5347917 7130556 10695834 21391668
Sum of all divisors σ(n): 56824320
Sum of proper divisors (its aliquot sum) s(n): 35432652
21391668 is an abundant number, because the sum of its proper divisors (35432652) is greater than itself. Its abundance is 14040984

Bases of 21391668

Binary: 1010001100110100100110100₂
Hexadecimal: 0x1466934
Base-36: CQHX0

Squares and roots of 21391668

21391668 squared (21391668²) is 457603459822224
21391668 cubed (21391668³) is 9788901288168354829632
The square root of 21391668 is 4625.1127553821
The cube root of 21391668 is 277.5970734161

Scales and comparisons

How big is 21391668?

21,391,668 seconds is equal to 35 weeks, 2 days, 14 hours, 7 minutes, 48 seconds.
To count from 1 to 21,391,668 would take you about nine 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 21391668 cubic inches would be around 23.1 feet tall.

Recreational maths with 21391668

21391668 backwards is 86619312
21391668 is a Harshad number.
The number of decimal digits it has is: 8
The sum of 21391668's digits is 36
More coming soon!

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The information we have on file for 21391668 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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