2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
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1100 550,2 275,2,2 55,5,2,2 11,5,5,2,2
It is: 22*52*11 = 1100
The smallest prime number in which all of the digits are also prime is 2.The smallest multi-digit prime number in which all of the digits are also prime is 23.
It is always 1 and the prime number itself.
The number 1 and the prime number itself.