111121102012121 has 4 divisors (see below), whose sum is σ = 114952864150500. Its totient is φ = 107289339873744.

The previous prime is 111121102012069. The next prime is 111121102012133. The reversal of 111121102012121 is 121210201121111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60967284504025 + 50153817508096 = 7808155^2 + 7081936^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121102012121 - 2⁴² = 106723055501017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111121102012121.

It is not an unprimeable number, because it can be changed into a prime (111121102012171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1915881069146 + ... + 1915881069203.

It is an arithmetic number, because the mean of its divisors is an integer number (28738216037625).

Almost surely, 2^{111121102012121} is an apocalyptic number.

It is an amenable number.

111121102012121 is a deficient number, since it is larger than the sum of its proper divisors (3831762138379).

111121102012121 is an equidigital number, since it uses as much as digits as its factorization.

111121102012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831762138378.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111121102012121 its reverse (121210201121111), we get a palindrome (232331303133232).

The spelling of 111121102012121 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred two million, twelve thousand, one hundred twenty-one".