121220111155473 has 16 divisors (see below), whose sum is σ = 195911290756800. Its totient is φ = 73466734033440.

The previous prime is 121220111155471. The next prime is 121220111155547. The reversal of 121220111155473 is 374551111022121.

121220111155473 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 20 + 1 + 1 + 11 + 554 + 73 = 666.

It is not a de Polignac number, because 121220111155473 - 2¹ = 121220111155471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121220111155471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204074260908 + ... + 204074261501.

It is an arithmetic number, because the mean of its divisors is an integer number (12244455672300).

Almost surely, 2^{121220111155473} is an apocalyptic number.

It is an amenable number.

121220111155473 is a deficient number, since it is larger than the sum of its proper divisors (74691179601327).

121220111155473 is a wasteful number, since it uses less digits than its factorization.

121220111155473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408148522429 (or 408148522423 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

Adding to 121220111155473 its reverse (374551111022121), we get a palindrome (495771222177594).

The spelling of 121220111155473 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred fifty-five thousand, four hundred seventy-three".