21218

21,218 is an even composite number composed of two prime numbers multiplied together.

What does the number 21218 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

21218 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 21218:

2 × 103²

(2 × 103 × 103)

See below for interesting mathematical facts about the number 21218 from the Numbermatics database.

Names of 21218

Cardinal: 21218 can be written as Twenty-one thousand, two hundred eighteen.

Scientific notation

Scientific notation: 2.1218 × 10⁴

Factors of 21218

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 3
Sum of prime factors: 105

Divisors of 21218

Number of divisors d(n): 6
Complete list of divisors:
1 2 103 206 10609 21218
Sum of all divisors σ(n): 32139
Sum of proper divisors (its aliquot sum) s(n): 10921
21218 is a deficient number, because the sum of its proper divisors (10921) is less than itself. Its deficiency is 10297

Bases of 21218

Binary: 101001011100010₂
Hexadecimal: 0x52E2
Base-36: GDE

Squares and roots of 21218

21218 squared (21218²) is 450203524
21218 cubed (21218³) is 9552418372232
The square root of 21218 is 145.6639969245
The cube root of 21218 is 27.6843808429

Scales and comparisons

How big is 21218?

21,218 seconds is equal to 5 hours, 53 minutes, 38 seconds.
To count from 1 to 21,218 would take you about five 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 21218 cubic inches would be around 2.3 feet tall.

Recreational maths with 21218

21218 backwards is 81212
The number of decimal digits it has is: 5
The sum of 21218's digits is 14
More coming soon!

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The information we have on file for 21218 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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