: In some digital libraries, this could be the ID for a specific stock video asset used by editors.
: Many web-based video downloaders or screen recording tools generate random or sequential strings (like "21071") when saving a file as an .mp4. 21071mp4
If you have a specific video in mind or a link where you saw this text, I can help you track down the original source or the "meme" it refers to. : In some digital libraries, this could be