20131313321 has 24 divisors (see below), whose sum is σ = 23845214016. Its totient is φ = 16942353120.

The previous prime is 20131313309. The next prime is 20131313357. The reversal of 20131313321 is 12331313102.

It is not a de Polignac number, because 20131313321 - 2²² = 20127119017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131313293 and 20131313302.

It is not an unprimeable number, because it can be changed into a prime (20131313821) 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, 1011155 + ... + 1030871.

It is an arithmetic number, because the mean of its divisors is an integer number (993550584).

Almost surely, 2^20131313321 is an apocalyptic number.

It is an amenable number.

20131313321 is a deficient number, since it is larger than the sum of its proper divisors (3713900695).

20131313321 is a wasteful number, since it uses less digits than its factorization.

20131313321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20109 (or 20102 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20131313321 its reverse (12331313102), we get a palindrome (32462626423).

The spelling of 20131313321 in words is "twenty billion, one hundred thirty-one million, three hundred thirteen thousand, three hundred twenty-one".