How many cells for 36120?

[coolhandcountry]

I got me a 36120 coming back from bk. I have 4 3s limn packs setting around as well.
I was debating on putting them in 12s form. I was wondering if the 36120 could handle that man. It put it about the 50.4 volt range fully charged.
What motor would take that voltage and stay under 42000 rpm?
Should be crazy any way if it works.