The number digits for twelve and four-tenths = 12.4
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In digits, 4 trillion is written as 4,000,000,000,000. This number consists of twelve digits, with each comma representing a group of three zeros to denote the magnitude of the number. The number 4 trillion is equivalent to 4 followed by twelve zeros, signifying a value of one thousand billion or one million million.
Twelve billion in number form is written as 12,000,000,000. This number is composed of twelve digits, with each digit representing a specific place value - from billions to ones. In the international system of numeration, each group of three digits is separated by a comma to aid in reading and understanding large numbers.
10.12
Well, you might add 12000 + 1200 + 12, but that is not the normal way to name this number. Usually you say "twelve hundred" if there are no higher digits.
Because life is based around the number twelve, eleven actually means one before twelve, but because humans have ten digits we chose to base it around ten. Look around you and everything, time and so on, is based on the number twelve and it is subtly hidden inside our language.