Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the total number of Pick, when Position is OT, when Overall is greater than 91, when Round is greater than 21, and when College is Mississippi?

### Inputs:
table_name: table, columns: ['Round', 'Pick', 'Overall', 'Name', 'Position', 'College']

### Response:
SELECT COUNT Pick FROM table WHERE Position = ot AND Overall > 91 AND Round > 21 AND College = mississippi