821578933834 has 16 divisors (see below), whose sum is σ = 1239313413600. Its totient is φ = 408474686224.

The previous prime is 821578933831. The next prime is 821578933837. The reversal of 821578933834 is 438339875128.

It is an interprime number because it is at equal distance from previous prime (821578933831) and next prime (821578933837).

It is not an unprimeable number, because it can be changed into a prime (821578933831) 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 7 ways as a sum of consecutive naturals, for example, 9687864 + ... + 9772300.

It is an arithmetic number, because the mean of its divisors is an integer number (77457088350).

Almost surely, 2^821578933834 is an apocalyptic number.

821578933834 is a deficient number, since it is larger than the sum of its proper divisors (417734479766).

821578933834 is a wasteful number, since it uses less digits than its factorization.

821578933834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111797.

The product of its digits is 34836480, while the sum is 61.

The spelling of 821578933834 in words is "eight hundred twenty-one billion, five hundred seventy-eight million, nine hundred thirty-three thousand, eight hundred thirty-four".