821406806682 has 48 divisors (see below), whose sum is σ = 2084757914592. Its totient is φ = 213352416480.

The previous prime is 821406806659. The next prime is 821406806687. The reversal of 821406806682 is 286608604128.

It is not an unprimeable number, because it can be changed into a prime (821406806687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126992253 + ... + 126998720.

It is an arithmetic number, because the mean of its divisors is an integer number (43432456554).

Almost surely, 2^821406806682 is an apocalyptic number.

821406806682 is an abundant number, since it is smaller than the sum of its proper divisors (1263351107910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821406806682 is a wasteful number, since it uses less digits than its factorization.

821406806682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253991003 (or 253990996 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 821406806682 in words is "eight hundred twenty-one billion, four hundred six million, eight hundred six thousand, six hundred eighty-two".