13111122013221 has 4 divisors (see below), whose sum is σ = 17481496017632. Its totient is φ = 8740748008812.

The previous prime is 13111122013201. The next prime is 13111122013261. The reversal of 13111122013221 is 12231022111131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13111122013221 - 2¹¹ = 13111122011173 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 (13111122013201) 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, 2185187002201 + ... + 2185187002206.

It is an arithmetic number, because the mean of its divisors is an integer number (4370374004408).

Almost surely, 2^{13111122013221} is an apocalyptic number.

It is an amenable number.

13111122013221 is a deficient number, since it is larger than the sum of its proper divisors (4370374004411).

13111122013221 is an equidigital number, since it uses as much as digits as its factorization.

13111122013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370374004410.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 13111122013221 its reverse (12231022111131), we get a palindrome (25342144124352).

The spelling of 13111122013221 in words is "thirteen trillion, one hundred eleven billion, one hundred twenty-two million, thirteen thousand, two hundred twenty-one".