11311212123 has 24 divisors (see below), whose sum is σ = 17307619056. Its totient is φ = 7093900800.

The previous prime is 11311212097. The next prime is 11311212139. The reversal of 11311212123 is 32121211311.

11311212123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11311212123 - 2²⁹ = 10774341211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11311212096 and 11311212105.

It is not an unprimeable number, because it can be changed into a prime (11311212163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332788 + ... + 365198.

It is an arithmetic number, because the mean of its divisors is an integer number (721150794).

Almost surely, 2^11311212123 is an apocalyptic number.

11311212123 is a deficient number, since it is larger than the sum of its proper divisors (5996406933).

11311212123 is a wasteful number, since it uses less digits than its factorization.

11311212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34715 (or 34712 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11311212123 its reverse (32121211311), we get a palindrome (43432423434).

The spelling of 11311212123 in words is "eleven billion, three hundred eleven million, two hundred twelve thousand, one hundred twenty-three".