321347395021 has 2 divisors, whose sum is σ = 321347395022. Its totient is φ = 321347395020.

The previous prime is 321347395013. The next prime is 321347395049. The reversal of 321347395021 is 120593743123.

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., 285204062025 + 36143332996 = 534045^2 + 190114^2 .

It is a cyclic number.

It is not a de Polignac number, because 321347395021 - 2³ = 321347395013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321347395001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160673697510 + 160673697511.

It is an arithmetic number, because the mean of its divisors is an integer number (160673697511).

Almost surely, 2^321347395021 is an apocalyptic number.

It is an amenable number.

321347395021 is a deficient number, since it is larger than the sum of its proper divisors (1).

321347395021 is an equidigital number, since it uses as much as digits as its factorization.

321347395021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 321347395021 in words is "three hundred twenty-one billion, three hundred forty-seven million, three hundred ninety-five thousand, twenty-one".