11211112123 has 4 divisors (see below), whose sum is σ = 11213032120. Its totient is φ = 11209192128.

The previous prime is 11211112097. The next prime is 11211112139. The reversal of 11211112123 is 32121111211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32121111211 = 7 ⋅4588730173.

It is a cyclic number.

It is not a de Polignac number, because 11211112123 - 2¹⁷ = 11210981051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211112097 and 11211112106.

It is not an unprimeable number, because it can be changed into a prime (11211112183) 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, 951213 + ... + 962926.

It is an arithmetic number, because the mean of its divisors is an integer number (2803258030).

Almost surely, 2^11211112123 is an apocalyptic number.

11211112123 is a deficient number, since it is larger than the sum of its proper divisors (1919997).

11211112123 is an equidigital number, since it uses as much as digits as its factorization.

11211112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919996.

The product of its digits is 24, while the sum is 16.

Adding to 11211112123 its reverse (32121111211), we get a palindrome (43332223334).

The spelling of 11211112123 in words is "eleven billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-three".