2100 cubes with a side length of 1 meter are stacked to form a solid cuboid. Its height is 10 meters, and its length and width are both integers greater than 10 (meters). How many meters is the sum of the length and width of a cuboid?
2100个边长为1米的正方体堆成一个实心的长方体．它的高是10米，长、宽都是大于10(米)的整数，问长方体长宽之和是几米？
<gadget id="calculator">15 + 14</gadget>
<output>29</output>

<result>29</result>