The Military Balance 2021 database says Russian storage facilities have around 10,200 tanks, including various T-72s, 3,000 T-80s, and 200 T-90s.
The database’s 2016 publication also indicates that Russia has roughly 2,800 Cold War legacy T-55s (the first tank type to feature a nuclear warfare protection system in the 1950s) in storage, as well as 2,500 T-62s and 2,000 T-64s.
This means that Russia may have around 17,300 tanks produced between the late 1950s and now.