111001021020121 has 64 divisors (see below), whose sum is σ = 125299519488000. Its totient is φ = 97715586124800.

The previous prime is 111001021020073. The next prime is 111001021020157. The reversal of 111001021020121 is 121020120100111.

It is a happy number.

It is not a de Polignac number, because 111001021020121 - 2²⁵ = 111000987465689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111001021020161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9982998400 + ... + 9983009518.

It is an arithmetic number, because the mean of its divisors is an integer number (1957804992000).

Almost surely, 2^{111001021020121} is an apocalyptic number.

It is an amenable number.

111001021020121 is a deficient number, since it is larger than the sum of its proper divisors (14298498467879).

111001021020121 is a wasteful number, since it uses less digits than its factorization.

111001021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12542.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111001021020121 its reverse (121020120100111), we get a palindrome (232021141120232).

The spelling of 111001021020121 in words is "one hundred eleven trillion, one billion, twenty-one million, twenty thousand, one hundred twenty-one".