21005
21,005 is an odd composite number composed of two prime numbers multiplied together.
21005 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.
Prime factorization of 21005:
5 × 4201
See below for interesting mathematical facts about the number 21005 from the Numbermatics database.
Names of 21005
- Cardinal: 21005 can be written as Twenty-one thousand and five.
Scientific notation
- Scientific notation: 2.1005 × 104
Factors of 21005
Divisors of 21005
Bases of 21005
- Binary: 1010010000011012
- Hexadecimal: 0x520D
- Base-36: G7H
Squares and roots of 21005
- 21005 squared (210052) is 441210025
- 21005 cubed (210053) is 9267616575125
-
The
square root of 21005 is 144.9310180741 -
The
cube root of 21005 is 27.5914312125
Scales and comparisons
How big is 21005?- 21,005 seconds is equal to 5 hours, 50 minutes, 5 seconds.
-
To count from 1 to 21,005 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 21005 cubic inches would be around 2.3 feet tall.
Recreational maths with 21005
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