404643020321 has 2 divisors, whose sum is σ = 404643020322. Its totient is φ = 404643020320.

The previous prime is 404643020303. The next prime is 404643020333. The reversal of 404643020321 is 123020346404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396980644096 + 7662376225 = 630064^2 + 87535^2 .

It is a cyclic number.

It is not a de Polignac number, because 404643020321 - 2³⁸ = 129765113377 is a prime.

It is not a weakly prime, because it can be changed into another prime (404643020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202321510160 + 202321510161.

It is an arithmetic number, because the mean of its divisors is an integer number (202321510161).

Almost surely, 2^404643020321 is an apocalyptic number.

It is an amenable number.

404643020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

404643020321 is an equidigital number, since it uses as much as digits as its factorization.

404643020321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 404643020321 its reverse (123020346404), we get a palindrome (527663366725).

The spelling of 404643020321 in words is "four hundred four billion, six hundred forty-three million, twenty thousand, three hundred twenty-one".