To simplify \( \frac{13^{19}}{13^{-9}} \), you can use the property of exponents that states \( \frac{a^m}{a^n} = a^{m-n} \).
Here, \( a = 13 \), \( m = 19 \), and \( n = -9 \). Substituting these values into the property gives:
\[ \frac{13^{19}}{13^{-9}} = 13^{19 - (-9)} = 13^{19 + 9} = 13^{28} \]
Thus, the simplified answer in exponential form is:
\[ \boxed{13^{28}} \]