Bob Supnik says the T11 sold "hundreds of thousands of units".
http://simh.trailing-edge.com/semi/t11.html There is no similar listing of other 11 series CPUs but what I remember hearing elsewhere was that the LSI-11 was a huge seller with probably about 300,000 to 400,000 used in PDP-11/03s plus all the alternate uses for the chips and the F-11 accounted for the remainder of DEC's 80s production of PDP-11s. I guess that would lead to a total production of 11 series CPUs in excess of the million mark which is good for a CPU line from before 1980 and not focused on being the absolute cheapest.
Note that the preceding are estimates based on third hand stories. I do not claim them to especially accurate.
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