808512869421 has 12 divisors (see below), whose sum is σ = 1167862696572. Its totient is φ = 539003606976.

The previous prime is 808512869389. The next prime is 808512869429. The reversal of 808512869421 is 124968215808.

808512869421 is a `hidden beast` number, since 8 + 0 + 8 + 512 + 86 + 9 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 86886405225 + 721626464196 = 294765^2 + 849486^2 .

It is not a de Polignac number, because 808512869421 - 2⁵ = 808512869389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808512869429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 803865 + ... + 1504401.

It is an arithmetic number, because the mean of its divisors is an integer number (97321891381).

Almost surely, 2^808512869421 is an apocalyptic number.

It is an amenable number.

808512869421 is a deficient number, since it is larger than the sum of its proper divisors (359349827151).

808512869421 is a wasteful number, since it uses less digits than its factorization.

808512869421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828780 (or 828777 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 808512869421 in words is "eight hundred eight billion, five hundred twelve million, eight hundred sixty-nine thousand, four hundred twenty-one".