321248621 has 2 divisors, whose sum is σ = 321248622. Its totient is φ = 321248620.

The previous prime is 321248611. The next prime is 321248623. The reversal of 321248621 is 126842123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205922500 + 115326121 = 14350^2 + 10739^2 .

It is an emirp because it is prime and its reverse (126842123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321248621 - 2²⁶ = 254139757 is a prime.

It is a Sophie Germain prime.

Together with 321248623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321248623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160624310 + 160624311.

It is an arithmetic number, because the mean of its divisors is an integer number (160624311).

Almost surely, 2^321248621 is an apocalyptic number.

It is an amenable number.

321248621 is a deficient number, since it is larger than the sum of its proper divisors (1).

321248621 is an equidigital number, since it uses as much as digits as its factorization.

321248621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 321248621 is about 17923.4098597337. The cubic root of 321248621 is about 684.8788540266.

The spelling of 321248621 in words is "three hundred twenty-one million, two hundred forty-eight thousand, six hundred twenty-one".