13111112111021 has 16 divisors (see below), whose sum is σ = 14007850176960. Its totient is φ = 12235060316160.

The previous prime is 13111112110981. The next prime is 13111112111107. The reversal of 13111112111021 is 12011121111131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13111112111021 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 (13111112111821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26643215 + ... + 27130851.

It is an arithmetic number, because the mean of its divisors is an integer number (875490636060).

Almost surely, 2^{13111112111021} is an apocalyptic number.

It is an amenable number.

13111112111021 is a deficient number, since it is larger than the sum of its proper divisors (896738065939).

13111112111021 is a wasteful number, since it uses less digits than its factorization.

13111112111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508844.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 13111112111021 its reverse (12011121111131), we get a palindrome (25122233222152).

The spelling of 13111112111021 in words is "thirteen trillion, one hundred eleven billion, one hundred twelve million, one hundred eleven thousand, twenty-one".