808004084821 has 2 divisors, whose sum is σ = 808004084822. Its totient is φ = 808004084820.

The previous prime is 808004084791. The next prime is 808004084857. The reversal of 808004084821 is 128480400808.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449395936900 + 358608147921 = 670370^2 + 598839^2 .

It is a cyclic number.

It is not a de Polignac number, because 808004084821 - 2²³ = 807995696213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808004084861) 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, 404002042410 + 404002042411.

It is an arithmetic number, because the mean of its divisors is an integer number (404002042411).

Almost surely, 2^808004084821 is an apocalyptic number.

It is an amenable number.

808004084821 is a deficient number, since it is larger than the sum of its proper divisors (1).

808004084821 is an equidigital number, since it uses as much as digits as its factorization.

808004084821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131072, while the sum is 43.

The spelling of 808004084821 in words is "eight hundred eight billion, four million, eighty-four thousand, eight hundred twenty-one".