13111111123111 has 4 divisors (see below), whose sum is σ = 13115762105400. Its totient is φ = 13106460140824.

The previous prime is 13111111123081. The next prime is 13111111123151. The reversal of 13111111123111 is 11132111111131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13111111123111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111111123151) 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, 2325486916 + ... + 2325492553.

It is an arithmetic number, because the mean of its divisors is an integer number (3278940526350).

Almost surely, 2^{13111111123111} is an apocalyptic number.

13111111123111 is a deficient number, since it is larger than the sum of its proper divisors (4650982289).

13111111123111 is an equidigital number, since it uses as much as digits as its factorization.

13111111123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650982288.

The product of its digits is 18, while the sum is 19.

Adding to 13111111123111 its reverse (11132111111131), we get a palindrome (24243222234242).

The spelling of 13111111123111 in words is "thirteen trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-three thousand, one hundred eleven".