How to open Split Multi-volume 7-ZIP compressed file archive (part 21) .7z.021 files
Have you had trouble opening the 7z.021 file on your computer? What are 7z.021 files? We explain what they are and recommend software that we know will open them.
What is 7z.021 file?
A 7z.021 file extension is related to the 7-zip compression tool. A 7z.021 contains a part of split multi-volume 7-ZIP compressed file archives (part 21).
Split Multi-volume 7-ZIP compressed file archive (part 21) description
The 7z.021 file extension is associated with 7-Zip. Its one part of a multi-volume compressed 7-ZIP archive. The extension is actually only 021, the .7z is added to the file name of the archive file to distinguish it as 71z multi-volume compressed file archive.
7-ZIP is the native format of 7-Zip archiver. Like other archives, 7-ZIP files are data containers, which store one or several files in a compressed form. Compressed archives are common on internet, especially on sharing or torrent sites.
Note, that 7-ZIP executable archives cannot be made as multi volume archives. The SFX 7-ZIP archive has the common EXE file extension.
In order to unpack the multi-volume 7-ZIP archive, you need to place ALL of the split parts in the same directory and start extraction of the first volume (7z.001). The program will automatically use all of the parts to extract the content of the archive.
Suggested software to open 7z.021 file

p7zip for Linux
Command line tool used to create and extract 7zip archives

p7zip for Mac
Mac version of file archiver

7-zip
Popular open source file archiver with a high compression ratio