If combining digits to form 2-digit numbers is allowed then some solutions are :-
21 + 3 - 5 = 19
23 + 1 - 5 = 19
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(4+2)x3+1=19
When you are using non-standard definitions of "plus" and "minus", or of "equal".
The number 19, divided by 2, is equal to 9, with a remainder of one. Nine times two is equal to 18, and then there is an extra one left, which would be remainder 1.
171 = 3^2*19.
1 x 38 2 x 19