321020505133 has 2 divisors, whose sum is σ = 321020505134. Its totient is φ = 321020505132.

The previous prime is 321020505109. The next prime is 321020505137. The reversal of 321020505133 is 331505020123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314852287689 + 6168217444 = 561117^2 + 78538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321020505133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321020505098 and 321020505107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321020505137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160510252566 + 160510252567.

It is an arithmetic number, because the mean of its divisors is an integer number (160510252567).

Almost surely, 2^321020505133 is an apocalyptic number.

It is an amenable number.

321020505133 is a deficient number, since it is larger than the sum of its proper divisors (1).

321020505133 is an equidigital number, since it uses as much as digits as its factorization.

321020505133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 321020505133 its reverse (331505020123), we get a palindrome (652525525256).

The spelling of 321020505133 in words is "three hundred twenty-one billion, twenty million, five hundred five thousand, one hundred thirty-three".