13220131323 has 32 divisors (see below), whose sum is σ = 20384686080. Its totient is φ = 7464955680.

The previous prime is 13220131279. The next prime is 13220131367. The reversal of 13220131323 is 32313102231.

It is an interprime number because it is at equal distance from previous prime (13220131279) and next prime (13220131367).

It is not a de Polignac number, because 13220131323 - 2¹³ = 13220123131 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 13220131323.

It is not an unprimeable number, because it can be changed into a prime (13220131423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 647436 + ... + 667542.

It is an arithmetic number, because the mean of its divisors is an integer number (637021440).

Almost surely, 2^13220131323 is an apocalyptic number.

13220131323 is a deficient number, since it is larger than the sum of its proper divisors (7164554757).

13220131323 is a wasteful number, since it uses less digits than its factorization.

13220131323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20487.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13220131323 its reverse (32313102231), we get a palindrome (45533233554).

The spelling of 13220131323 in words is "thirteen billion, two hundred twenty million, one hundred thirty-one thousand, three hundred twenty-three".