'Cant store encrypted Integer in Database

I am Developing a website using Laravel that accept Online payment with Credit card and this must be encrypted before storing into the database I am Using RC4 Encryption to encrypt an integer then store it in my database it throwing an error cause after encryption it looks like that r ���`�q� so weird symbols and logos it cannot be stored as my database collation is utf16 general_ci I used something else but it didn't work [This Error1



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