$${\begin{array}{l} \frac {1,989 \, \cdot \, 10^{30}} {9,109 \, \cdot \, 10^{-31}} = \frac {1,989} {9,109} \cdot 10^{30-(-31)} \\ \approx 0,22 \cdot 10^{61} \\ = 2,2 \cdot 10^{60} \end {array}}$$