1304440221391 has 2 divisors, whose sum is σ = 1304440221392. Its totient is φ = 1304440221390.

The previous prime is 1304440221379. The next prime is 1304440221419. The reversal of 1304440221391 is 1931220444031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1304440221391 - 2¹⁹ = 1304439697103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304440222391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652220110695 + 652220110696.

It is an arithmetic number, because the mean of its divisors is an integer number (652220110696).

Almost surely, 2^{1304440221391} is an apocalyptic number.

1304440221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304440221391 is an equidigital number, since it uses as much as digits as its factorization.

1304440221391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 1304440221391 in words is "one trillion, three hundred four billion, four hundred forty million, two hundred twenty-one thousand, three hundred ninety-one".