$.11 NLHE MTT Deep Stacked: Deep Stack BB Defense Against Short Stack CO All In

I don’t get a big stack advantage very often, so I wasn’t sure how to play this spot. I would appreciate any advice on how to play this hand.It’s about halfway through a 5 hour late registration $0.11 Freezeout.

I am in the BB with A10o and a healthy 180 BB sitting about 3/80 with about 2.5 hours of late registration remaining.

UTG with 13 BB limps into the pot.

It folds down to CO who shoves 21 BB.