Im assuming you could find tons of players with those same stats per 36 over the last 15 years
Since 2000-2001, there are only 27 seasons where a player qualifying for the leaderboards on b-r.com had between 19 and 21 points and between 10 and 12 rebounds per 36 minutes. Tim Duncan and Kevin Garnett combine for 13 of those seasons. Al Jefferson, Jermaine O'Neal, and David Lee are the other players to have multiple such seasons.
If you take it the 57 seasons in the same timeframe where a player had 19+ points and 10+ rebounds per 36 minutes with no upper bound, 19 of them are by TD/KG and another 6 by Shaq.