$2^{7} \cdot 10^{5} \cdot 5^{7}$
Raise $2$$128 \cdot 10^{5} \cdot 5^{7}$
Move the decimal point in $128$$1 28 \cdot 10^{7} \cdot 5^{7}$
Raise $5$$1 28 \cdot 10^{7} \cdot 78125$
Multiply $1$$78125$
Move the decimal point in $100000$$1 \cdot 10^{12}$
Multiply $10^{12}$$10^{12}$
Raise $10$$1000000000000$