21105

21,105 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21105 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

21105 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 21105:

3² × 5 × 7 × 67

(3 × 3 × 5 × 7 × 67)

See below for interesting mathematical facts about the number 21105 from the Numbermatics database.

Names of 21105

Cardinal: 21105 can be written as Twenty-one thousand, one hundred five.

Scientific notation

Scientific notation: 2.1105 × 10⁴

Factors of 21105

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 82

Divisors of 21105

Number of divisors d(n): 24
Complete list of divisors:
1 3 5 7 9 15 21 35 45 63 67 105 201 315 335 469 603 1005 1407 2345 3015 4221 7035 21105
Sum of all divisors σ(n): 42432
Sum of proper divisors (its aliquot sum) s(n): 21327
21105 is an abundant number, because the sum of its proper divisors (21327) is greater than itself. Its abundance is 222

Bases of 21105

Binary: 101001001110001₂
Hexadecimal: 0x5271
Base-36: GA9

Squares and roots of 21105

21105 squared (21105²) is 445421025
21105 cubed (21105³) is 9400610732625
The square root of 21105 is 145.2756001535
The cube root of 21105 is 27.6351474089

Scales and comparisons

How big is 21105?

21,105 seconds is equal to 5 hours, 51 minutes, 45 seconds.
To count from 1 to 21,105 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 21105 cubic inches would be around 2.3 feet tall.

Recreational maths with 21105

21105 backwards is 50112
21105 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 21105's digits is 9
More coming soon!

Copy this link to share with anyone:

Share this page on social media:

Link to this page

HTML: To link to this page, just copy and paste the link below into your blog, web page or email.

<a href="https://numbermatics.com/n/21105/?utm_source=shared">Number 21105 - Facts about the integer</a>

BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:

[url=https://numbermatics.com/n/21105/?utm_source=shared]Number 21105 - Facts about the integer[/url]

Cite this page

MLA style:
"Number 21105 - Facts about the integer". Numbermatics.com. 2024. Web. 25 April 2024.

APA style:
Numbermatics. (2024). Number 21105 - Facts about the integer. Retrieved 25 April 2024, from https://numbermatics.com/n/21105/

Chicago style:
Numbermatics. 2024. "Number 21105 - Facts about the integer". https://numbermatics.com/n/21105/

The information we have on file for 21105 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!

Keywords: Divisors of 21105, math, Factors of 21105, curriculum, school, college, exams, university, Prime factorization of 21105, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, one hundred five.