If the annual payroll is 21173895, what is the establishments?
CREATE TABLE "table1_23802822_1" (
  "sector" text,
  "establishments" real,
  "sales_receipts_or_shipments_1_000" real,
  "annual_payroll_1_000" real,
  "paid_employees" real
);
SELECT "establishments" FROM "table1_23802822_1" WHERE "annual_payroll_1_000"=21173895;