321120178949 has 2 divisors, whose sum is σ = 321120178950. Its totient is φ = 321120178948.

The previous prime is 321120178943. The next prime is 321120178961. The reversal of 321120178949 is 949871021123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169573474849 + 151546704100 = 411793^2 + 389290^2 .

It is an emirp because it is prime and its reverse (949871021123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321120178949 - 2³² = 316825211653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321120178943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160560089474 + 160560089475.

It is an arithmetic number, because the mean of its divisors is an integer number (160560089475).

Almost surely, 2^321120178949 is an apocalyptic number.

It is an amenable number.

321120178949 is a deficient number, since it is larger than the sum of its proper divisors (1).

321120178949 is an equidigital number, since it uses as much as digits as its factorization.

321120178949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 321120178949 in words is "three hundred twenty-one billion, one hundred twenty million, one hundred seventy-eight thousand, nine hundred forty-nine".