There is no standard technical feature or official software code identified as "21324mp4." This string appears to be a specific filename or a localized reference rather than a universal feature.
: The number 21324 appears in various retail catalogs, such as for Star Sapphires or hardware components. The "mp4" suffix in your query might be a mistyped reference to a product video or an MP4 player model. 21324mp4
: In rare cases, such strings can appear in logs if a feature pack or specific file is being referenced by a serial number or internal identifier, similar to how Lenovo or other hardware vendors use Feature Codes for storage arrays. Obtain the feature pack - Lenovo Documentation There is no standard technical feature or official