121220111221026 has 64 divisors (see below), whose sum is σ = 246215676672000. Its totient is φ = 39782273895936.

The previous prime is 121220111221007. The next prime is 121220111221031. The reversal of 121220111221026 is 620122111022121.

It is a junction number, because it is equal to n+sod(n) for n = 121220111220987 and 121220111221005.

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 31 ways as a sum of consecutive naturals, for example, 98044555 + ... + 99273233.

It is an arithmetic number, because the mean of its divisors is an integer number (3847119948000).

Almost surely, 2^{121220111221026} is an apocalyptic number.

121220111221026 is an abundant number, since it is smaller than the sum of its proper divisors (124995565450974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220111221026 is a wasteful number, since it uses less digits than its factorization.

121220111221026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229663.

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 121220111221026 its reverse (620122111022121), we get a palindrome (741342222243147).

The spelling of 121220111221026 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, twenty-six".