20310320011391 has 2 divisors, whose sum is σ = 20310320011392. Its totient is φ = 20310320011390.

The previous prime is 20310320011321. The next prime is 20310320011417. The reversal of 20310320011391 is 19311002301302.

It is an a-pointer prime, because the next prime (20310320011417) can be obtained adding 20310320011391 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310320011391 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20310320011391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310320011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155160005695 + 10155160005696.

It is an arithmetic number, because the mean of its divisors is an integer number (10155160005696).

Almost surely, 2^{20310320011391} is an apocalyptic number.

20310320011391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310320011391 is an equidigital number, since it uses as much as digits as its factorization.

20310320011391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

Adding to 20310320011391 its reverse (19311002301302), we get a palindrome (39621322312693).

The spelling of 20310320011391 in words is "twenty trillion, three hundred ten billion, three hundred twenty million, eleven thousand, three hundred ninety-one".