Answer:
0.00000002119188
Explanation:
If you enter this number into a spreadsheet (with a single E), you can set the display format to show you the value in standard form. The exponent (E) of -8 indicates the most-significant digit (2) is in the 8th place to the right of the decimal point:
= 2.119188×10^-8
= 0.00000002119188