821435806112 has 12 divisors (see below), whose sum is σ = 1617201743346. Its totient is φ = 410717903040.

The previous prime is 821435806069. The next prime is 821435806127. The reversal of 821435806112 is 211608534128.

It can be written as a sum of positive squares in only one way, i.e., 734318741776 + 87117064336 = 856924^2 + 295156^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 821435806112.

It is an unprimeable number.

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, 12834934439 + ... + 12834934502.

Almost surely, 2^821435806112 is an apocalyptic number.

It is an amenable number.

821435806112 is a deficient number, since it is larger than the sum of its proper divisors (795765937234).

821435806112 is a wasteful number, since it uses less digits than its factorization.

821435806112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25669868951 (or 25669868943 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 821435806112 in words is "eight hundred twenty-one billion, four hundred thirty-five million, eight hundred six thousand, one hundred twelve".