111213011121 has 4 divisors (see below), whose sum is σ = 148284014832. Its totient is φ = 74142007412.

The previous prime is 111213011111. The next prime is 111213011123. The reversal of 111213011121 is 121110312111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111213011121 - 2⁵ = 111213011089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111213011121.

It is not an unprimeable number, because it can be changed into a prime (111213011123) 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, 18535501851 + ... + 18535501856.

It is an arithmetic number, because the mean of its divisors is an integer number (37071003708).

Almost surely, 2^111213011121 is an apocalyptic number.

It is an amenable number.

111213011121 is a deficient number, since it is larger than the sum of its proper divisors (37071003711).

111213011121 is an equidigital number, since it uses as much as digits as its factorization.

111213011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37071003710.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 111213011121 its reverse (121110312111), we get a palindrome (232323323232).

The spelling of 111213011121 in words is "one hundred eleven billion, two hundred thirteen million, eleven thousand, one hundred twenty-one".