-1
Another opinion
If this question in asking about so-called "absolute numbers" - which are numbers without any signs (+ or -) - then there is no whole number predecessor to zero.
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That doesn't make sense. "Predecessor" and "successor" are defined for whole numbers, not for decimal numbers.
The whole numbers are all numbers zero and up (including zero ).
Natural numbers, which were around before the concept of negative numbers
Integers
Negative integers are whole numbers but not natural numbers. Mathematicians are undecided about zero. It is a whole number: some believe zero is a natural number, others do not.