21396978

21,396,978 is an even composite number composed of three prime numbers multiplied together.

What does the number 21396978 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

21396978 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

Prime factorization of 21396978:

2 × 3² × 1188721

(2 × 3 × 3 × 1188721)

See below for interesting mathematical facts about the number 21396978 from the Numbermatics database.

Names of 21396978

Cardinal: 21396978 can be written as Twenty-one million, three hundred ninety-six thousand, nine hundred seventy-eight.

Scientific notation

Scientific notation: 2.1396978 × 10⁷

Factors of 21396978

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 4
Sum of prime factors: 1188726

Divisors of 21396978

Number of divisors d(n): 12
Complete list of divisors:
1 2 3 6 9 18 1188721 2377442 3566163 7132326 10698489 21396978
Sum of all divisors σ(n): 46360158
Sum of proper divisors (its aliquot sum) s(n): 24963180
21396978 is an abundant number, because the sum of its proper divisors (24963180) is greater than itself. Its abundance is 3566202

Bases of 21396978

Binary: 1010001100111110111110010₂
Hexadecimal: 0x1467DF2
Base-36: CQM0I

Squares and roots of 21396978

21396978 squared (21396978²) is 457830667532484
21396978 cubed (21396978³) is 9796192720917874433352
The square root of 21396978 is 4625.6867598229
The cube root of 21396978 is 277.6200405905

Scales and comparisons

How big is 21396978?

21,396,978 seconds is equal to 35 weeks, 2 days, 15 hours, 36 minutes, 18 seconds.
To count from 1 to 21,396,978 would take you about eleven 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 21396978 cubic inches would be around 23.1 feet tall.

Recreational maths with 21396978

21396978 backwards is 87969312
The number of decimal digits it has is: 8
The sum of 21396978's digits is 45
More coming soon!

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The information we have on file for 21396978 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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