20312111020321 has 2 divisors, whose sum is σ = 20312111020322. Its totient is φ = 20312111020320.

The previous prime is 20312111020297. The next prime is 20312111020393. The reversal of 20312111020321 is 12302011121302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10173548160000 + 10138562860321 = 3189600^2 + 3184111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312111020321 - 2¹¹ = 20312111018273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312111029321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156055510160 + 10156055510161.

It is an arithmetic number, because the mean of its divisors is an integer number (10156055510161).

Almost surely, 2^{20312111020321} is an apocalyptic number.

It is an amenable number.

20312111020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312111020321 is an equidigital number, since it uses as much as digits as its factorization.

20312111020321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20312111020321 its reverse (12302011121302), we get a palindrome (32614122141623).

The spelling of 20312111020321 in words is "twenty trillion, three hundred twelve billion, one hundred eleven million, twenty thousand, three hundred twenty-one".