21387420

21,387,420 is an even composite number composed of four prime numbers multiplied together.

What does the number 21387420 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 36 divisors.

21387420 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of thirty-six divisors.

Prime factorization of 21387420:

2² × 3² × 5 × 118819

(2 × 2 × 3 × 3 × 5 × 118819)

See below for interesting mathematical facts about the number 21387420 from the Numbermatics database.

Names of 21387420

Cardinal: 21387420 can be written as Twenty-one million, three hundred eighty-seven thousand, four hundred twenty.

Scientific notation

Scientific notation: 2.138742 × 10⁷

Factors of 21387420

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 6
Sum of prime factors: 118829

Divisors of 21387420

Number of divisors d(n): 36
Complete list of divisors:
1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 118819 237638 356457 475276 594095 712914 1069371 1188190 1425828 1782285 2138742 2376380 3564570 4277484 5346855 7129140 10693710 21387420
Sum of all divisors σ(n): 64875720
Sum of proper divisors (its aliquot sum) s(n): 43488300
21387420 is an abundant number, because the sum of its proper divisors (43488300) is greater than itself. Its abundance is 22100880

Bases of 21387420

Binary: 1010001100101100010011100₂
Hexadecimal: 0x146589C
Base-36: CQEN0

Squares and roots of 21387420

21387420 squared (21387420²) is 457421734256400
21387420 cubed (21387420³) is 9783070747670014488000
The square root of 21387420 is 4624.6535005339
The cube root of 21387420 is 277.5786969399

Scales and comparisons

How big is 21387420?

21,387,420 seconds is equal to 35 weeks, 2 days, 12 hours, 57 minutes.
To count from 1 to 21,387,420 would take you about seven 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 21387420 cubic inches would be around 23.1 feet tall.

Recreational maths with 21387420

21387420 backwards is 02478312
The number of decimal digits it has is: 8
The sum of 21387420's digits is 27
More coming soon!

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The information we have on file for 21387420 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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