Question 366483
Let x & y represent the 2 digits

x + y = xy
    y = xy - x
    y = x(y-1)
    x = y/(y-1)

If y=1, x is undifined
   y=2, x = 2 (the only solution)
   y=3, x = 6
   y=4, x = 12

The number is 22