321054305521 has 2 divisors, whose sum is σ = 321054305522. Its totient is φ = 321054305520.

The previous prime is 321054305491. The next prime is 321054305587. The reversal of 321054305521 is 125503450123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292506823921 + 28547481600 = 540839^2 + 168960^2 .

It is an emirp because it is prime and its reverse (125503450123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321054305521 - 2⁵ = 321054305489 is a prime.

It is a super-2 number, since 2×321054305521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321054305591) 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, 160527152760 + 160527152761.

It is an arithmetic number, because the mean of its divisors is an integer number (160527152761).

Almost surely, 2^321054305521 is an apocalyptic number.

It is an amenable number.

321054305521 is a deficient number, since it is larger than the sum of its proper divisors (1).

321054305521 is an equidigital number, since it uses as much as digits as its factorization.

321054305521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 321054305521 its reverse (125503450123), we get a palindrome (446557755644).

The spelling of 321054305521 in words is "three hundred twenty-one billion, fifty-four million, three hundred five thousand, five hundred twenty-one".