821209084806 has 32 divisors (see below), whose sum is σ = 1791763089408. Its totient is φ = 248846491040.

The previous prime is 821209084769. The next prime is 821209084807. The reversal of 821209084806 is 608480902128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821209084807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5079835 + ... + 5239001.

It is an arithmetic number, because the mean of its divisors is an integer number (55992596544).

Almost surely, 2^821209084806 is an apocalyptic number.

821209084806 is an abundant number, since it is smaller than the sum of its proper divisors (970554004602).

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

821209084806 is a wasteful number, since it uses less digits than its factorization.

821209084806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237356.

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 821209084806 in words is "eight hundred twenty-one billion, two hundred nine million, eighty-four thousand, eight hundred six".