2*3*5*7*11*13*17, there are seven numbers multiplied in this formula, please answer: what is the sum of all digits in the final product? Please tell me how you calculated it?
2*3*5*7*11*13*17，这个算式中有七个数连乘，请回答：最后得到的乘积中，所有数位上的数字和是多少？请讲一讲你是怎样算的？
<gadget id="calculator">5 + 1 + 5 + 1</gadget>
<output>12</output>

<result>12</result>