1304240321 has 2 divisors, whose sum is σ = 1304240322. Its totient is φ = 1304240320.

The previous prime is 1304240297. The next prime is 1304240341. The reversal of 1304240321 is 1230424031.

It is an a-pointer prime, because the next prime (1304240341) can be obtained adding 1304240321 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198890625 + 105349696 = 34625^2 + 10264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304240321 - 2¹⁴ = 1304223937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1304240293 and 1304240302.

It is not a weakly prime, because it can be changed into another prime (1304240341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652120160 + 652120161.

It is an arithmetic number, because the mean of its divisors is an integer number (652120161).

Almost surely, 2^1304240321 is an apocalyptic number.

It is an amenable number.

1304240321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304240321 is an equidigital number, since it uses as much as digits as its factorization.

1304240321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1304240321 is about 36114.2675545275. The cubic root of 1304240321 is about 1092.5782250017.

Adding to 1304240321 its reverse (1230424031), we get a palindrome (2534664352).

The spelling of 1304240321 in words is "one billion, three hundred four million, two hundred forty thousand, three hundred twenty-one".