13111110331221 has 24 divisors (see below), whose sum is σ = 20337055536000. Its totient is φ = 7491526684992.

The previous prime is 13111110331181. The next prime is 13111110331273. The reversal of 13111110331221 is 12213301111131.

It is not a de Polignac number, because 13111110331221 - 2²⁶ = 13111043222357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111110331421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1127776 + ... + 5243481.

It is an arithmetic number, because the mean of its divisors is an integer number (847377314000).

Almost surely, 2^{13111110331221} is an apocalyptic number.

It is an amenable number.

13111110331221 is a deficient number, since it is larger than the sum of its proper divisors (7225945204779).

13111110331221 is a wasteful number, since it uses less digits than its factorization.

13111110331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6385273 (or 6385266 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 13111110331221 its reverse (12213301111131), we get a palindrome (25324411442352).

The spelling of 13111110331221 in words is "thirteen trillion, one hundred eleven billion, one hundred ten million, three hundred thirty-one thousand, two hundred twenty-one".