How many hot-swap drive bays does this server support?

This server supports 36 hot-swap 3.5" drive bays, and it also has 2 additional hot-swap 2.5'' NVMe drive bays.

What type of processors can be used with the Asrock Rack 4U36L6E-ICX2/2T storage server?

The Asrock Rack 4U36L6E-ICX2/2T storage server supports 3rd Gen Intel Xeon Scalable processors using Dual Socket P+ (LGA 4189).

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Asrock Rack 4U36L6E-ICX2/2T 4U Rackmount Storage Server Barebone Dual Socket P+ (LGA 4189) C621A 3rd Gen Intel® Xeon® Scalable Processors Dual 10GLAN

4U Rackmount with 1+1 Platinum 1200W CRPS
Support Dual Socket P+ (LGA 4189), supports 3rd Gen Intel Xeon Scalable processors
Support 8+8 DIMM slots, support DDR4 RDIMM/ LRDIMM
Support 36 Hot-swap 3.5" drive bays and 4 of those can also support 2.5" NVMe drives
Support 2 Hot-swap 2.5'' NVMe drive bays
Support Dual 10GbE RJ45 by Intel® X550-AT2
Remote management (IPMI)