21752827 for 12.1.0.2.121020_Linux-x86-64
When I use support.oracle.com patch analysis to get a compatible version of this patch I always receive the AIX version instead of the Linux-x86-64.
1) Add patch 31550110 for Linux-x86-64 (Oct 2020 RDBMS PSU)
2) Then add 21752827.
3) Request merge patch.
4) Download
5) Result: p21752827_12102201020_AIX64-5L.zip with no option to select the correct platform.