8323128821 has 16 divisors (see below), whose sum is σ = 10075176576. Its totient is φ = 6712129536.

The previous prime is 8323128817. The next prime is 8323128823. The reversal of 8323128821 is 1288213238.

8323128821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8323128821 - 2² = 8323128817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8323128823) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 387845 + ... + 408741.

It is an arithmetic number, because the mean of its divisors is an integer number (629698536).

Almost surely, 2^8323128821 is an apocalyptic number.

It is an amenable number.

8323128821 is a deficient number, since it is larger than the sum of its proper divisors (1752047755).

8323128821 is a wasteful number, since it uses less digits than its factorization.

8323128821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24268.

The product of its digits is 36864, while the sum is 38.

The square root of 8323128821 is about 91231.1833804648. The cubic root of 8323128821 is about 2026.5727817696.

The spelling of 8323128821 in words is "eight billion, three hundred twenty-three million, one hundred twenty-eight thousand, eight hundred twenty-one".