An Integer whose size is guaranteed to be 32 bits System unit
  type LongInt = -2147483648..2147483647;
The LongInt type is a 32 bit signed Integer. This size is fixed, and will not change in future releases of Delphi. It is currently the same size as the Integer type.
To hold very large signed integers, use the Int64 type.
Related commands
Byte An integer type supporting values 0 to 255
Cardinal The basic unsigned integer type
Int64 A 64 bit sized integer - the largest in Delphi
Integer The basic Integer type
LongWord A 32 bit unsigned integer
ShortInt An integer type supporting values -128 to 127
SmallInt An Integer type supporting values from -32768 to 32767
Word An integer type supporting values 0 to 65535
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Example code : Showing the capacity of LongInt
  min, max : LongInt;
  // Set the minimum and maximum values of this data type
  min := Low(LongInt);
  max := High(LongInt);
  ShowMessage('Min longint value = '+IntToStr(min));
  ShowMessage('Max longint value = '+IntToStr(max));

Show full unit code
   Min longint value = -2147483648
   Max longint value = 2147483647
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