CREATE TABLE table_21570 ("Fin. Pos" FLOAT, "Car No." FLOAT, "Driver" TEXT, "Team" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT, "Laps Led" FLOAT, "Points" TEXT)

What is the car number for driver H lio Castroneves
SELECT MIN("Car No.") FROM table_21570 WHERE "Driver" = 'Hélio Castroneves'
SELECT MIN("Car No.") FROM "table_21570" WHERE "Driver" = 'Hélio Castroneves'