821833634990 has 32 divisors (see below), whose sum is σ = 1495272242880. Its totient is φ = 325191066624.

The previous prime is 821833634957. The next prime is 821833635013. The reversal of 821833634990 is 99436338128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527432 + ... + 1386308.

It is an arithmetic number, because the mean of its divisors is an integer number (46727257590).

Almost surely, 2^821833634990 is an apocalyptic number.

821833634990 is a deficient number, since it is larger than the sum of its proper divisors (673438607890).

821833634990 is a wasteful number, since it uses less digits than its factorization.

821833634990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859916.

The product of its (nonzero) digits is 6718464, while the sum is 56.

It can be divided in two parts, 82183 and 3634990, that added together give a palindrome (3717173).

The spelling of 821833634990 in words is "eight hundred twenty-one billion, eight hundred thirty-three million, six hundred thirty-four thousand, nine hundred ninety".