324040021 has 2 divisors, whose sum is σ = 324040022. Its totient is φ = 324040020.

The previous prime is 324040007. The next prime is 324040033. The reversal of 324040021 is 120040423.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245079025 + 78960996 = 15655^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 324040021 - 2¹⁹ = 323515733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 324039977 and 324040004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (324040001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162020010 + 162020011.

It is an arithmetic number, because the mean of its divisors is an integer number (162020011).

Almost surely, 2^324040021 is an apocalyptic number.

It is an amenable number.

324040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

324040021 is an equidigital number, since it uses as much as digits as its factorization.

324040021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 324040021 is about 18001.1116601170. Note that the first 3 decimals coincide. The cubic root of 324040021 is about 686.8568237558.

Adding to 324040021 its reverse (120040423), we get a palindrome (444080444).

The spelling of 324040021 in words is "three hundred twenty-four million, forty thousand, twenty-one".