△/□=100…21, when □ is the smallest, what should △ be?
△/□=100…21中，□最小时，△应是多少
<gadget id="calculator">21 + 1</gadget>
<output>22</output>

<gadget id="calculator">100 * 22</gadget>
<output>2_200</output>

<gadget id="calculator">2_200 + 21</gadget>
<output>2_221</output>

<result>2_221</result>