821209084804 has 12 divisors (see below), whose sum is σ = 1458565389904. Its totient is φ = 404476116264.

The previous prime is 821209084769. The next prime is 821209084807. The reversal of 821209084804 is 408480902128.

821209084804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 1532106234 + ... + 1532106769.

Almost surely, 2^821209084804 is an apocalyptic number.

It is an amenable number.

821209084804 is a deficient number, since it is larger than the sum of its proper divisors (637356305100).

821209084804 is a wasteful number, since it uses less digits than its factorization.

821209084804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064213074 (or 3064213072 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 821209084804 in words is "eight hundred twenty-one billion, two hundred nine million, eighty-four thousand, eight hundred four".