21218421

21,218,421 is an odd composite number composed of five prime numbers multiplied together.

What does the number 21218421 look like?

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

21218421 is an odd composite number. It is composed of five distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 21218421:

3 × 7² × 19 × 71 × 107

(3 × 7 × 7 × 19 × 71 × 107)

See below for interesting mathematical facts about the number 21218421 from the Numbermatics database.

Names of 21218421

Cardinal: 21218421 can be written as Twenty-one million, two hundred eighteen thousand, four hundred twenty-one.

Scientific notation

Scientific notation: 2.1218421 × 10⁷

Factors of 21218421

Number of distinct prime factors ω(n): 5
Total number of prime factors Ω(n): 6
Sum of prime factors: 207

Divisors of 21218421

Number of divisors d(n): 48
Complete list of divisors:
1 3 7 19 21 49 57 71 107 133 147 213 321 399 497 749 931 1349 1491 2033 2247 2793 3479 4047 5243 6099 7597 9443 10437 14231 15729 22791 28329 42693 53179 66101 99617 144343 159537 198303 298851 372253 433029 1010401 1116759 3031203 7072807 21218421
Sum of all divisors σ(n): 35458560
Sum of proper divisors (its aliquot sum) s(n): 14240139
21218421 is a deficient number, because the sum of its proper divisors (14240139) is less than itself. Its deficiency is 6978282

Bases of 21218421

Binary: 1010000111100010001110101₂
Hexadecimal: 0x143C475
Base-36: CMS8L

Squares and roots of 21218421

21218421 squared (21218421²) is 450221389733241
21218421 cubed (21218421³) is 9552986990564985232461
The square root of 21218421 is 4606.3457317051
The cube root of 21218421 is 276.8456394291

Scales and comparisons

How big is 21218421?

21,218,421 seconds is equal to 35 weeks, 14 hours, 21 seconds.
To count from 1 to 21,218,421 would take you about four days!

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 21218421 cubic inches would be around 23.1 feet tall.

Recreational maths with 21218421

21218421 backwards is 12481212
21218421 is a Harshad number.
The number of decimal digits it has is: 8
The sum of 21218421's digits is 21
More coming soon!

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The information we have on file for 21218421 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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