I'm a bit unsure about what you're looking for because "" could refer to a few different things. It seems to be a generic filename used for various video clips across the web.
: There are records of a file named "21845.mp4" being used in promotional posts for Bim Maroc (a supermarket chain) in Morocco. 21845mp4
Could you clarify if you are looking for information regarding one of the following: I'm a bit unsure about what you're looking
: The filename appears on platforms like Mail.Ru as a personal video upload. 21845mp4