How many stars are there?

At the moment, I’m reading a fascinating book of cosmology called “You Are Here” and written by Christopher Potter. It’s full of intriguing facts.
Potter takes the reader on a tour of the universe in 26 degrees of separation starting with the range 1-10 metres (10 to the power of 0 to 10 to the power of 1) and ending with the range over 10 billion light years (over 10 to the power of 26 metres). At the end, he concludes that the known universe contains between 30-50 billion trillion stars (that is between 3 x 10 the power of 22 and 5 x 10 to the power of 22).
Put in conventional numerical form, that is at least:
30,000,000,000,000,000,000,000 stars


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