20102311321 has 8 divisors (see below), whose sum is σ = 20825181000. Its totient is φ = 19381420800.

The previous prime is 20102311261. The next prime is 20102311349. The reversal of 20102311321 is 12311320102.

It can be written as a sum of positive squares in 4 ways, for example, as 2397081600 + 17705229721 = 48960^2 + 133061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102311321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102311295 and 20102311304.

It is not an unprimeable number, because it can be changed into a prime (20102311421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474096 + ... + 514753.

It is an arithmetic number, because the mean of its divisors is an integer number (2603147625).

Almost surely, 2^20102311321 is an apocalyptic number.

It is an amenable number.

20102311321 is a deficient number, since it is larger than the sum of its proper divisors (722869679).

20102311321 is an equidigital number, since it uses as much as digits as its factorization.

20102311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989579.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20102311321 its reverse (12311320102), we get a palindrome (32413631423).

The spelling of 20102311321 in words is "twenty billion, one hundred two million, three hundred eleven thousand, three hundred twenty-one".