13221431311 has 4 divisors (see below), whose sum is σ = 14423379624. Its totient is φ = 12019483000.

The previous prime is 13221431309. The next prime is 13221431339. The reversal of 13221431311 is 11313412231.

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 13221431311 - 2¹ = 13221431309 is a prime.

It is a super-2 number, since 2×13221431311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221437311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600974140 + ... + 600974161.

It is an arithmetic number, because the mean of its divisors is an integer number (3605844906).

Almost surely, 2^13221431311 is an apocalyptic number.

13221431311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13221431311 is a deficient number, since it is larger than the sum of its proper divisors (1201948313).

13221431311 is a wasteful number, since it uses less digits than its factorization.

13221431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201948312.

The product of its digits is 432, while the sum is 22.

Adding to 13221431311 its reverse (11313412231), we get a palindrome (24534843542).

The spelling of 13221431311 in words is "thirteen billion, two hundred twenty-one million, four hundred thirty-one thousand, three hundred eleven".