821883670084 has 9 divisors (see below), whose sum is σ = 1438299595677. Its totient is φ = 410940928464.

The previous prime is 821883670081. The next prime is 821883670103. The reversal of 821883670084 is 480076388128.

The square root of 821883670084 is 906578.

It is a perfect power (a square), and thus also a powerful number.

821883670084 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 698598415684 + 123285254400 = 835822^2 + 351120^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821883670081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1586512 + ... + 2039800.

Almost surely, 2^821883670084 is an apocalyptic number.

821883670084 is the 906578-th square number.

It is an amenable number.

821883670084 is a deficient number, since it is larger than the sum of its proper divisors (616415925593).

821883670084 is an frugal number, since it uses more digits than its factorization.

821883670084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906582 (or 453291 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 55.

The spelling of 821883670084 in words is "eight hundred twenty-one billion, eight hundred eighty-three million, six hundred seventy thousand, eighty-four".