11111103123 has 16 divisors (see below), whose sum is σ = 15335218080. Its totient is φ = 7147513856.

The previous prime is 11111103089. The next prime is 11111103203. The reversal of 11111103123 is 32130111111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111103123 is a prime.

It is a super-2 number, since 2×11111103123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11111103623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103411 + ... + 181427.

It is an arithmetic number, because the mean of its divisors is an integer number (958451130).

Almost surely, 2^11111103123 is an apocalyptic number.

11111103123 is a deficient number, since it is larger than the sum of its proper divisors (4224114957).

11111103123 is a wasteful number, since it uses less digits than its factorization.

11111103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79686.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 11111103123 its reverse (32130111111), we get a palindrome (43241214234).

The spelling of 11111103123 in words is "eleven billion, one hundred eleven million, one hundred three thousand, one hundred twenty-three".