Why does 19216811 not work?
An IP address has four number groups separated by dots. 19216811 is just 192.168.1.1 typed without dots, so browsers do not treat it as a valid IP address.
How do I access my router?
Type http://192.168.1.1 in the browser address bar (not the search bar). If it does not open, try 192.168.0.1.