21909940

21,909,940 is an even composite number composed of five prime numbers multiplied together.

What does the number 21909940 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 48 divisors.

21909940 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 21909940:

2² × 5 × 13 × 17 × 4957

(2 × 2 × 5 × 13 × 17 × 4957)

See below for interesting mathematical facts about the number 21909940 from the Numbermatics database.

Names of 21909940

Cardinal: 21909940 can be written as Twenty-one million, nine hundred nine thousand, nine hundred forty.

Scientific notation

Scientific notation: 2.190994 × 10⁷

Factors of 21909940

Number of distinct prime factors ω(n): 5
Total number of prime factors Ω(n): 6
Sum of prime factors: 4994

Divisors of 21909940

Number of divisors d(n): 48
Complete list of divisors:
1 2 4 5 10 13 17 20 26 34 52 65 68 85 130 170 221 260 340 442 884 1105 2210 4420 4957 9914 19828 24785 49570 64441 84269 99140 128882 168538 257764 322205 337076 421345 644410 842690 1095497 1288820 1685380 2190994 4381988 5477485 10954970 21909940
Sum of all divisors σ(n): 52475472
Sum of proper divisors (its aliquot sum) s(n): 30565532
21909940 is an abundant number, because the sum of its proper divisors (30565532) is greater than itself. Its abundance is 8655592

Bases of 21909940

Binary: 1010011100101000110110100₂
Hexadecimal: 0x14E51B4
Base-36: D1LTG

Squares and roots of 21909940

21909940 squared (21909940²) is 480045470803600
21909940 cubed (21909940³) is 10517767462578627784000
The square root of 21909940 is 4680.8054862385
The cube root of 21909940 is 279.8210591373

Scales and comparisons

How big is 21909940?

21,909,940 seconds is equal to 36 weeks, 1 day, 14 hours, 5 minutes, 40 seconds.
To count from 1 to 21,909,940 would take you about two weeks!

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 21909940 cubic inches would be around 23.3 feet tall.

Recreational maths with 21909940

21909940 backwards is 04990912
21909940 is a Harshad number.
The number of decimal digits it has is: 8
The sum of 21909940's digits is 34
More coming soon!

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The information we have on file for 21909940 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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