user: Question: How many were penanced with 0 executions in effigie for a total of 21?
Columns: ['Tribunal', 'Number of autos da fé with known sentences', 'Executions in persona', 'Executions in effigie', 'Penanced', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Lisbon', '248 (1540–1794)', '461', '181', '7024', '7666']
SQL:

assistant: SELECT COUNT("Penanced") FROM "Table" WHERE "Executions in effigie" = '0' AND "Total" = '21';