There are 19: 17 27 37 47 57 67 70 71 72 73 74 75 76 77 78 79 87 and 97
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04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
There are 17 of them.
There is only one such number.
There are 21 two-digit prime numbers.
Let's count them out... 12 20 21 22 23 24 25 26 27 28 29 32 42 52 62 72 82 92 Whew... that makes 18 two-digit numbers that have a "2".