321440410420397 has 2 divisors, whose sum is σ = 321440410420398. Its totient is φ = 321440410420396.

The previous prime is 321440410420249. The next prime is 321440410420403. The reversal of 321440410420397 is 793024014044123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204985966963561 + 116454443456836 = 14317331^2 + 10791406^2 .

It is an emirp because it is prime and its reverse (793024014044123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321440410420397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321440410420097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160720205210198 + 160720205210199.

It is an arithmetic number, because the mean of its divisors is an integer number (160720205210199).

Almost surely, 2^{321440410420397} is an apocalyptic number.

It is an amenable number.

321440410420397 is a deficient number, since it is larger than the sum of its proper divisors (1).

321440410420397 is an equidigital number, since it uses as much as digits as its factorization.

321440410420397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 321440410420397 in words is "three hundred twenty-one trillion, four hundred forty billion, four hundred ten million, four hundred twenty thousand, three hundred ninety-seven".