CRJ-200 Captain reported encountering wake turbulence departing ATL in trail of an A321 that resulted in a momentary stick shaker and stick pusher event.

Narrative

Our preflight and taxi out was normal. Weather was nice and winds were calm. I was PF (Pilot Flying) and the takeoff roll was normal; following an Airbus 321. After rotation; the FO (First Officer) called out 'positive rate' and I responded with 'gear up'. Right when he put the gear level up; we encountered the wake of the aircraft in front of us. We were at a normal pitch attitude of about 12 degrees of pitch at the time of encountering the wake. The aircraft then pitched up a degree or two and banked to the left at the same time. Right when it happened the aural warning of the stick pusher sounded; stick shaker started and stick pusher engaged all at the same time for about 1 second. It pushed us down about a degree or two of pitch then kicked off. I continued pitching down until about 10 degrees and monitored our airspeed which was about 165 KIAS and increasing. We then made sure the aircraft was flying normally and continued cleaning it up and the rest of the flight was uneventful.Wake turbulence causing stick pusher event.