You need at least two numbers to find an LCM. If that's 5 and 21, since they don't have any prime factors in common, you multiply them together to find their LCM.
Attack of the Show - 2005 1-521 was released on: USA: 4 June 2007
Green Screen Adventures - 2007 Show 521 5-21 was released on: USA: 1 December 2012
It is: 1*521 = 521 which is a prime number
The positive integer factors of 521 are: 1, 521
decimal for 521 percent = 5.21521% = 521%/100% = 5.21
32x-521 = -489
It is: 521 = DXXI
521698/1000 = 521.698 so there are 521 thousands
521 + 152451 = 152972
521 = DXXI
521 is a Prime Number.
LCM means least common multiple. We need two or more numbers to have a common multiple. So there is not LCM of 12.