20313102221 has 2 divisors, whose sum is σ = 20313102222. Its totient is φ = 20313102220.

The previous prime is 20313102181. The next prime is 20313102289. The reversal of 20313102221 is 12220131302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18330181321 + 1982920900 = 135389^2 + 44530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20313102221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20313102221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20318102221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156551110 + 10156551111.

It is an arithmetic number, because the mean of its divisors is an integer number (10156551111).

Almost surely, 2^20313102221 is an apocalyptic number.

It is an amenable number.

20313102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313102221 is an equidigital number, since it uses as much as digits as its factorization.

20313102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20313102221 its reverse (12220131302), we get a palindrome (32533233523).

The spelling of 20313102221 in words is "twenty billion, three hundred thirteen million, one hundred two thousand, two hundred twenty-one".