193 - now that East Timor is independent - is probably the safest figure to go with, as Sft suggests, though for a different reason. It depends, you see, on whose list you accept. The American Government, for example, does not recognise Taiwan, but most other countries do. The United Nations does not include the Vatican or Switzerland, though the people of the latter country recently voted to join. (I'm not sure whether that has gone through yet.) Are Scotland, England and Wales three countries or just one as the bulk of the United Kingdom? And so it goes on. The figure of 193 includes the Vatican and Switzerland and treats the UK as one.