No, there is no smallest decimal number. Decimal numbers represent real numbers and between any two real numbers there are infinitely many other real numbers. So, there are infinitely many decimal numbers between 0 and your 1.21: each one will be smaller than 1.21
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fraction 121-25 written in a decimal = 4.84121/25:= 121 ÷ 25= 4.84 in decimal
0.1818
64.0 is the smallest decimal
The smallest is 121.
The smallest perfect square is 121.