111123123111 has 216 divisors, whose sum is σ = 224815617936. Its totient is φ = 51991994880.

The previous prime is 111123123091. The next prime is 111123123121. The reversal of 111123123111 is 111321321111.

It is not a de Polignac number, because 111123123111 - 2¹⁵ = 111123090343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111123123121) 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 215 ways as a sum of consecutive naturals, for example, 116603011 + ... + 116603963.

It is an arithmetic number, because the mean of its divisors is an integer number (1040813046).

Almost surely, 2^111123123111 is an apocalyptic number.

111123123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111123123111 is an abundant number, since it is smaller than the sum of its proper divisors (113692494825).

111123123111 is a wasteful number, since it uses less digits than its factorization.

111123123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1030 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 111123123111 its reverse (111321321111), we get a palindrome (222444444222).

The spelling of 111123123111 in words is "one hundred eleven billion, one hundred twenty-three million, one hundred twenty-three thousand, one hundred eleven".