Assuming a datacenter is more or less filled with $current_year chips, the number of of flops is kind of a meaninglessly large number. It's big. How big? Big enough it needs a nuclear power plant to run.
Not to mention it would assume that number wouldn't change...but of course it depends entirely on what type of compute is there as well as the fact that every few years truckloads of hardware gets replaced and the compute goes up.
