After expanding a decimal to 100 times of it, move the decimal point to the left three places, then expand the obtained decimal to 1000 times of it, and finally move the decimal point to the left by one place, the decimal becomes 21.05, this What is the original decimal?
把一个小数扩大到它的100倍后，小数点再向左移动三位，再把得到的这个小数扩大到它的1000倍，最后把小数点向左移动一位后，这个小数变成了21.05，这个小数原来是多少？
<gadget id="calculator">21.05 / 10</gadget>
<output>2.105</output>

<result>2.105</result>