A total of 2,181 students in the Experimental Primary School have participated in accident insurance this year, and 40% of the total number of students have not participated in the insurance. How many students are there in the Experimental Primary School?
实验小学今年共有2181名同学参加了意外事故保险，没有参保的占总人数的40%，实验小学共有多少名学生？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2_181 / (3/5)</gadget>
<output>3_635</output>

<result>3_635</result>