What is the units' digit of the following expression (11)^5*(1)^3*(21)^5

What is the units' digit of the following expression (11)^5*(1)^3*(21)^5?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #44468