How many flying cars are there in the world?

0 they did not make flying cars and I never saw one

Many people and companies have made flying cars from Henry Ford and his "Sky Flivver" in 1926, the US Army's "Flying Jeeps" project of the 1950s, and even Flight Innovations Inc's "Sky Commuter" concept from the 1980s.

The big problem is that all of these were experimental prototypes, and no "flying cars" have been made commercially available.  

Many people do keep trying to make flying cars a commercial reality though, and in 2013 a company called Terrafugia announced they would make a self-flying, hybrid tilt-rotor vehicle that would be ready for sale sometime between 2021-2025

Binary code is the right answer