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Twenty-one


Here is information about "twenty-one" that you may find useful and interesting.


Number Systems
Twenty-one is a decimal number and can be written with numbers:

21

Binary is a number system with only 0s and 1s. Twenty-one in binary form is displayed below:

10101

A Hexadecimal number has a base of 16 which means it includes the numbers 0 to 9 and A through F. Twenty-one converted to hexadecimal is:

15

Roman Numerals is another number system. Below is twenty-one in roman numerals:

XXI



Scientific Notation
Sometimes calculators and scientists shorten numbers using scientific notation. Here is twenty-one as a scientific notation:

2.1E+01


Math
Here are some math facts about Twenty-one:

Twenty-one is a rational number and an integer.

Twenty-one is an odd number because it is not divisible by two.

Twenty-one is divisible by the following numbers:

1, 3, 7, 21

Twenty-one is not a square number because no number multiplied by itself will equal twenty-one.




Number Lookup
Twenty-one is not the only number we have information about. Go here to look up other numbers.



Translated
Here we have translated twenty-one into some of the most commonly used languages:

Chinese:
二十一

French:
vingt et un

German:
einundzwanzig

Italian:
ventuno

Spanish:
veintiuno





Currency
Here is twenty-one written in different currencies:

US Dollars:
$21

Canadian Dollars:
CA$21

Australian Dollars:
A$21

British Pounds:
£21

Indian Rupee:
₹21

Euros:
€21




Ordinal
The cardinal number twenty-one can also be written as an ordinal number:

21st

Or if you want to write it with letters only:

twenty-first.



Twenty-two
Go here for the next number on our list that we have information about.


 


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