404400000421 has 2 divisors, whose sum is σ = 404400000422. Its totient is φ = 404400000420.

The previous prime is 404400000401. The next prime is 404400000451. The reversal of 404400000421 is 124000004404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331113930625 + 73286069796 = 575425^2 + 270714^2 .

It is a cyclic number.

It is not a de Polignac number, because 404400000421 - 2⁹ = 404399999909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404400000401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202200000210 + 202200000211.

It is an arithmetic number, because the mean of its divisors is an integer number (202200000211).

Almost surely, 2^404400000421 is an apocalyptic number.

It is an amenable number.

404400000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

404400000421 is an equidigital number, since it uses as much as digits as its factorization.

404400000421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 404400000421 its reverse (124000004404), we get a palindrome (528400004825).

The spelling of 404400000421 in words is "four hundred four billion, four hundred million, four hundred twenty-one", and thus it is an aban number.