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While 422 isn't strictly a "storage full" error (that’s 413), you need double the space of the Minecraft APK + OBB files. Minecraft is roughly 850MB, but it needs 1.7GB free to unpack.
If you are trying to download the "Error 422 Creepypasta Version" (a fan-made horror mod) just for fun: Download Minecraft Error 422 Android Fix
If Minecraft is trying to install to an SD card that is slow or corrupted, the 422 error triggers. While 422 isn't strictly a "storage full" error