The int field in Solr is A numeric field that can contain 32-bit signed two's complement integer values
.
Min Value Allowed: -2147483648
Max Value Allowed: 2147483647
Use Long which is A numeric field that can contain 64-bit signed two's complement integer values
.
Min Value Allowed: -9223372036854775808
Max Value Allowed: 9223372036854775807