elementary number theory - Find the last two digits of $2^{2156789}$

Find the last two digits of $2^{2156789}$.

My try:

As $2156789 = 4* 539197 + 1$
The unit digit of $2^{2156789}$ is similar to the unit digit of $2^{4n+1}$ which is equal to 2.
But I'm unable to find the tens digit. Please help me.