user: Question: What is the largest number of households with median family income of $52,106 with less than 21403 in population?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Summit', '$40,270', '$79,461', '$91,286', 36324.0, 12990.0]
SQL:

assistant: SELECT MAX("Number of households") FROM "Table" WHERE "Median family income" = '$52,106' AND "Population" < 21403.0;