| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Mod | 3rd group (Type IX-modified-2) |
| Built by | Sudomekh (Leningrad, U.S.S.R.) / Yard 196 |
| Ordered | |
| Laid down | 31 Dec 1939 |
| Launched | 25 Apr 1941 |
| Commissioned | 29 Mar 1946 |
| End service | 14 Mar 1959 |
| History | Decommissioned on 14 March 1959. |
We don't have any commands listed for USSR S-21
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