111110121 has 6 divisors (see below), whose sum is σ = 160492410. Its totient is φ = 74073408.

The previous prime is 111110093. The next prime is 111110143. The reversal of 111110121 is 121011111.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 10890000 = 10011^2 + 3300^2 .

It is not a de Polignac number, because 111110121 - 2⁵ = 111110089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 12345569 = 111110121 / (1 + 1 + 1 + 1 + 1 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (111110821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6172776 + ... + 6172793.

It is an arithmetic number, because the mean of its divisors is an integer number (26748735).

Almost surely, 2^111110121 is an apocalyptic number.

It is an amenable number.

111110121 is a deficient number, since it is larger than the sum of its proper divisors (49382289).

111110121 is a wasteful number, since it uses less digits than its factorization.

111110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12345575 (or 12345572 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 111110121 is about 10540.8785686963. The cubic root of 111110121 is about 480.7484287776.

Adding to 111110121 its reverse (121011111), we get a palindrome (232121232).

The spelling of 111110121 in words is "one hundred eleven million, one hundred ten thousand, one hundred twenty-one".