Error Code: 1062. Duplicate entry '2147483647' for key
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"Error Code: 1062. Duplicate entry '2147483647' for key <key name>" is an error message returned by MySQL when a query attempts to set a signed 4-byte integer field to an unsigned value that is too large to represent as a signed 4-byte integer. "2147483647" is 7F.FF.FF.FF in hexadecimal, i.e. the largest positive 4-byte signed integer.
You will get this error if you try to store 2147483648 (or any larger integer) in a 4-byte signed integer (INT(11) SIGNED) field.