The school has a rectangular flower pond with a length of 12 meters and a width of 9 meters. If 21 flowers are planted per square meter, how many flowers can be planted in this flower pond?
学校有一个长方形花池长12米，宽9米，如果每平方米栽21株花，这个花池一共能栽多少株花？
<gadget id="calculator">12 * 9 * 21</gadget>
<output>2_268</output>

<result>2_268</result>