\[\boxed{\mathbf{428}.}\]
\[1)\ 21\frac{3}{10} = 21,3\]
\[2)\ 5\frac{144}{1000} = 5,144\]
\[3)\ 1\frac{5}{100} = 1,05\]
\[4)\ 2\frac{4}{1000} = 2,004\]
\[5)\ \frac{6}{1000} = 0,006\]
\[6)\ 2\frac{5}{100000} = 2,00005\]