It is a cyclic number.
It is a self number, because there is not a number n which added to its sum of digits gives 12120211000221.
It is a congruent number.
Almost surely, 212120211000221 is an apocalyptic number.
It is an amenable number.
12120211000221 is an equidigital number, since it uses as much as digits as its factorization.
12120211000221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4040070333410.
Adding to 12120211000221 its reverse (12200011202121), we get a palindrome (24320222202342).
The spelling of 12120211000221 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one", and thus it is an aban number.