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(elisp)Integer Type

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Integer Type
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   The range of values for integers in Emacs Lisp is -134217728 to
134217727 (28 bits; i.e., -2**27 to 2**27 - 1) on most machines.  (Some
machines may provide a wider range.)  It is important to note that the
Emacs Lisp arithmetic functions do not check for overflow.  Thus `(1+
134217727)' is -134217728 on most machines.

   The read syntax for integers is a sequence of (base ten) digits with
an optional sign at the beginning and an optional period at the end.
The printed representation produced by the Lisp interpreter never has a
leading `+' or a final `.'.

     -1               ; The integer -1.
     1                ; The integer 1.
     1.               ; Also the integer 1.
     +1               ; Also the integer 1.
     268435457        ; Also the integer 1 on a 28-bit implementation.

   Note: Numbers, for more information.