Capitalization means using a capital letter at the head of a word.
We always capitalize:
historical events, periods, and documents
names of departments
names of groups (national, political, social, racial, civic, and athletic groups)
However, we do not capitalize words like a, an, the, or of.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.