Every ESC has a maximum commutation limit (the speed at which it can switch phases), but it's down to the ESC's CPU. The faster the motor spins, the more phase switches it requires, and the harder the ESC's CPU has to work in order to process this. This used to be a potential problem on older ESCs where it'd be entirely possible to exceed what their CPUs could handle, but within modern ESCs (at least, good modern ESCs like the MMM), this limit is extremely high. So much so, that nobody really states the maximum commutation rating anymore.
So yup, your MMM will handle a 6-pole 2100kv motor with total ease.
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You can buy a 9000kv 2 pole motor, but you will never see even a 4000kv 12 pole outrunner
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You'd be surprised at some of the smaller heli motors you can buy; I have a 4000kv 9-pole outrunner in my heli which I run on 3S. Even then, the Hyperion ESC I run it on doesn't have a problem with it...but it must be on the borders of what it can handle. And Lutach has some crazy 9000kv 6-pole, or something lol.