Answer
$$19.7 \times 10^{-6} .$$
Work Step by Step
By adding the exponents and multiplying the like terms, we have $$ (2.7\times 10^{9} ) (27\times 10^{-6}) (270\times 10^{-12})\\ = (2.7 ) (27) (270)\times 10^{9-6-12}\\ =19683 \times 10^{-9}=19.7 \times 10^{-6} .$$