121220111221028 has 24 divisors (see below), whose sum is σ = 212247615833400. Its totient is φ = 60577937491968.

The previous prime is 121220111221007. The next prime is 121220111221031. The reversal of 121220111221028 is 820122111022121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12741887098084 + 108478224122944 = 3569578^2 + 10415288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121220111220988 and 121220111221006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230467076 + ... + 230992452.

It is an arithmetic number, because the mean of its divisors is an integer number (8843650659725).

Almost surely, 2^{121220111221028} is an apocalyptic number.

It is an amenable number.

121220111221028 is a deficient number, since it is larger than the sum of its proper divisors (91027504612372).

121220111221028 is a wasteful number, since it uses less digits than its factorization.

121220111221028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555839 (or 555837 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 121220111221028 its reverse (820122111022121), we get a palindrome (941342222243149).

The spelling of 121220111221028 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, twenty-eight".