What is 22527 in error_reporting 22527 of phpinfo

This value is actually bitmap mask, a sum of constants.

So, 22527 is

  16384 E_USER_DEPRECATED
+
  4096  E_RECOVERABLE_ERROR
+
  etc...

In your case it’s E_ALL & ~E_DEPRECATED, it will display every error, except E_DEPRECATED.

PHP versions below 5.4 will also exclude E_STRICT errors (since E_STRICT is not included in E_ALL before that version)