321533551057 has 2 divisors, whose sum is σ = 321533551058. Its totient is φ = 321533551056.

The previous prime is 321533551043. The next prime is 321533551061. The reversal of 321533551057 is 750155335123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313962984976 + 7570566081 = 560324^2 + 87009^2 .

It is a cyclic number.

It is not a de Polignac number, because 321533551057 - 2⁷ = 321533550929 is a prime.

It is not a weakly prime, because it can be changed into another prime (321533551067) 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, 160766775528 + 160766775529.

It is an arithmetic number, because the mean of its divisors is an integer number (160766775529).

Almost surely, 2^321533551057 is an apocalyptic number.

It is an amenable number.

321533551057 is a deficient number, since it is larger than the sum of its proper divisors (1).

321533551057 is an equidigital number, since it uses as much as digits as its factorization.

321533551057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236250, while the sum is 40.

The spelling of 321533551057 in words is "three hundred twenty-one billion, five hundred thirty-three million, five hundred fifty-one thousand, fifty-seven".