11123112011 has 4 divisors (see below), whose sum is σ = 12134304024. Its totient is φ = 10111920000.

The previous prime is 11123111977. The next prime is 11123112017. The reversal of 11123112011 is 11021132111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11123112011 - 2¹⁸ = 11122849867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11123112017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505595990 + ... + 505596011.

It is an arithmetic number, because the mean of its divisors is an integer number (3033576006).

Almost surely, 2^11123112011 is an apocalyptic number.

11123112011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11123112011 is a deficient number, since it is larger than the sum of its proper divisors (1011192013).

11123112011 is a wasteful number, since it uses less digits than its factorization.

11123112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011192012.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11123112011 its reverse (11021132111), we get a palindrome (22144244122).

The spelling of 11123112011 in words is "eleven billion, one hundred twenty-three million, one hundred twelve thousand, eleven".