111112121231 has 4 divisors (see below), whose sum is σ = 112131498600. Its totient is φ = 110092743864.

The previous prime is 111112121209. The next prime is 111112121233. The reversal of 111112121231 is 132121211111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132121211111 = 673 ⋅196316807.

It is a cyclic number.

It is not a de Polignac number, because 111112121231 - 2⁶ = 111112121167 is a prime.

It is a super-2 number, since 2×111112121231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112121233) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 509688521 + ... + 509688738.

It is an arithmetic number, because the mean of its divisors is an integer number (28032874650).

Almost surely, 2^111112121231 is an apocalyptic number.

111112121231 is a deficient number, since it is larger than the sum of its proper divisors (1019377369).

111112121231 is a wasteful number, since it uses less digits than its factorization.

111112121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019377368.

The product of its digits is 24, while the sum is 17.

Adding to 111112121231 its reverse (132121211111), we get a palindrome (243233332342).

The spelling of 111112121231 in words is "one hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, two hundred thirty-one".