This looks like a mix of:
: The "021021" in your query likely refers to a release or update date (October 2, 2021). Content & Theme
This could represent a specific timestamp (21 minutes and 21 seconds) or a target duration for a preview clip. In technical scripting, it may also be a date-based versioning code (February 10, 2021). 3. Service Level: free
: This is the unique production code for the video, often referred to as a "CID" or "Product ID." It belongs to the
: Typically a production or series code used by distributors or online databases to categorize specific episodes or titles.