Table schema:
CREATE TABLE table_name_61 (number_of_households INTEGER, per_capita_income VARCHAR, population VARCHAR)

Question: Which Number of households has Per capita income of $21,571, and a Population smaller than 9,783?
SQL: SELECT AVG(number_of_households) FROM table_name_61 WHERE per_capita_income = "$21,571" AND population < 9 OFFSET 783