It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-121220107026727 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 121220107026727.
It is a congruent number.
Almost surely, 2121220107026727 is an apocalyptic number.
121220107026727 is an equidigital number, since it uses as much as digits as its factorization.
121220107026727 is an odious number, because the sum of its binary digits is odd.
Adding to 121220107026727 its reverse (727620701022121), we get a palindrome (848840808048848).
The spelling of 121220107026727 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred seven million, twenty-six thousand, seven hundred twenty-seven".