The LCM is 513.
The least common multiple of 19 , 15 , 27 , 21 = 17,955
You can't find the LCM of a single number. You need at least two. If that's 19 and 27, the LCM is 513.
LCM of 120 and 27
The LCM is 162.
The LCM is 675.
The LCM is 540.
The LCM is 135.
The LCM is 594.
The LCM is 216.
The LCM is 297.