How to startup database from pfile

SQL>  SHUTDOWN

ERROR:

ORA-01034: ORACLE not available

ORA-27101: shared memory realm does not exist

Process ID: 0

Session ID: 0 Serial number: 0

 SQL> startup pfile=D:\appdb19c\app\OracleHomeUser1\admin\orcl\pfile\init.ora.513202112044

ORACLE instance started.

Total System Global Area 2516579304 bytes

Fixed Size                  9053160 bytes

Variable Size             541065216 bytes

Database Buffers         1958739968 bytes

Redo Buffers                7720960 bytes

Database mounted.

Database opened.