It is a strong prime.
It is a cyclic number.
It is a congruent number.
Almost surely, 212120211001111 is an apocalyptic number.
12120211001111 is an equidigital number, since it uses as much as digits as its factorization.
12120211001111 is an odious number, because the sum of its binary digits is odd.
Adding to 12120211001111 its reverse (11110011202121), we get a palindrome (23230222203232).
The spelling of 12120211001111 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, one thousand, one hundred eleven".