20321312273 has 2 divisors, whose sum is σ = 20321312274. Its totient is φ = 20321312272.

The previous prime is 20321312243. The next prime is 20321312317. The reversal of 20321312273 is 37221312302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978864704 + 8342447569 = 109448^2 + 91337^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321312273 - 2⁸ = 20321312017 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321312203) 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, 10160656136 + 10160656137.

It is an arithmetic number, because the mean of its divisors is an integer number (10160656137).

Almost surely, 2^20321312273 is an apocalyptic number.

It is an amenable number.

20321312273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321312273 is an equidigital number, since it uses as much as digits as its factorization.

20321312273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 20321312273 its reverse (37221312302), we get a palindrome (57542624575).

The spelling of 20321312273 in words is "twenty billion, three hundred twenty-one million, three hundred twelve thousand, two hundred seventy-three".