20321205335797 has 2 divisors, whose sum is σ = 20321205335798. Its totient is φ = 20321205335796.

The previous prime is 20321205335759. The next prime is 20321205335813. The reversal of 20321205335797 is 79753350212302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17658535266436 + 2662670069361 = 4202206^2 + 1631769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321205335797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20321205335797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321205335707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160602667898 + 10160602667899.

It is an arithmetic number, because the mean of its divisors is an integer number (10160602667899).

Almost surely, 2^{20321205335797} is an apocalyptic number.

It is an amenable number.

20321205335797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321205335797 is an equidigital number, since it uses as much as digits as its factorization.

20321205335797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2381400, while the sum is 49.

The spelling of 20321205335797 in words is "twenty trillion, three hundred twenty-one billion, two hundred five million, three hundred thirty-five thousand, seven hundred ninety-seven".