111345111521 has 32 divisors (see below), whose sum is σ = 131937361920. Its totient is φ = 91952611200.

The previous prime is 111345111503. The next prime is 111345111529. The reversal of 111345111521 is 125111543111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111345111521 - 2³⁰ = 110271369697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111345111529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57660926 + ... + 57662856.

It is an arithmetic number, because the mean of its divisors is an integer number (4123042560).

Almost surely, 2^111345111521 is an apocalyptic number.

It is an amenable number.

111345111521 is a deficient number, since it is larger than the sum of its proper divisors (20592250399).

111345111521 is a wasteful number, since it uses less digits than its factorization.

111345111521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005.

The product of its digits is 600, while the sum is 26.

Adding to 111345111521 its reverse (125111543111), we get a palindrome (236456654632).

The spelling of 111345111521 in words is "one hundred eleven billion, three hundred forty-five million, one hundred eleven thousand, five hundred twenty-one".