I am passing an integer value of more than 11 digits to a rule, which in turn co

I am passing an integer value of more than 11 digits to a rule, which in turn converts the integer to text. The rule uses the function mid/padleft/padright aren't showing any output. It is showing an error message stating that null parameter is passed to the function.
Is it possible for a process id to have more 10 digits?
May i know what is the maximum length of the Process Instance ID?
Kindly confirm....
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OriginalPostID-131566

OriginalPostID-131566