$2.20 NLHE MTT Deep Stacked: call a 21 eff. BB shove with ATo on the big blind?

https://www.boomplayer.com/28889891_4285B4ACED

should I be calling here? what should be my calling range?

Well since we dom't have aby infos about the stage of the mtt ( is it really close to bubble? Or not) or about the oponent if he is agresive or a total nit.. if everything ia kind of in the middle and we are not exactly on the bubble i call shoves from the button with 20bb everytime. Firstly because it would be so wierd for him to shove stuff like AQ+ and pretty much any pair.. why would he just want to make a 20bb guy fold

I actually feel like we get shown small pairs, Ax, and broadway quite a fair bit but with so little info it's hard to say. I do think we tend to get shown weaker pairs rather than say TT+, but I don't think AQ and AJ are out of the question. Still, I'd probably be calling here since as Gohaku implies, we just don't expect the top of his range to do this, and he would love to take it down with a lot of weaker hands and things we are flipping with.