13221221311 has 4 divisors (see below), whose sum is σ = 13222746400. Its totient is φ = 13219696224.

The previous prime is 13221221267. The next prime is 13221221327. The reversal of 13221221311 is 11312212231.

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

It is a cyclic number.

It is not a de Polignac number, because 13221221311 - 2⁹ = 13221220799 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 (13221291311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749466 + ... + 766903.

It is an arithmetic number, because the mean of its divisors is an integer number (3305686600).

Almost surely, 2^13221221311 is an apocalyptic number.

13221221311 is a deficient number, since it is larger than the sum of its proper divisors (1525089).

13221221311 is an equidigital number, since it uses as much as digits as its factorization.

13221221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525088.

The product of its digits is 144, while the sum is 19.

Adding to 13221221311 its reverse (11312212231), we get a palindrome (24533433542).

The spelling of 13221221311 in words is "thirteen billion, two hundred twenty-one million, two hundred twenty-one thousand, three hundred eleven".