324336721 has 2 divisors, whose sum is σ = 324336722. Its totient is φ = 324336720.

The previous prime is 324336697. The next prime is 324336739. The reversal of 324336721 is 127633423.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162919696 + 161417025 = 12764^2 + 12705^2 .

It is an emirp because it is prime and its reverse (127633423) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 324336721 - 2²¹ = 322239569 is a prime.

It is not a weakly prime, because it can be changed into another prime (324337721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162168360 + 162168361.

It is an arithmetic number, because the mean of its divisors is an integer number (162168361).

Almost surely, 2^324336721 is an apocalyptic number.

It is an amenable number.

324336721 is a deficient number, since it is larger than the sum of its proper divisors (1).

324336721 is an equidigital number, since it uses as much as digits as its factorization.

324336721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 31.

The square root of 324336721 is about 18009.3509322241. The cubic root of 324336721 is about 687.0663948368.

The spelling of 324336721 in words is "three hundred twenty-four million, three hundred thirty-six thousand, seven hundred twenty-one".