821316068 has 12 divisors (see below), whose sum is σ = 1437778860. Its totient is φ = 410522112.

The previous prime is 821316031. The next prime is 821316079. The reversal of 821316068 is 860613128.

It can be written as a sum of positive squares in 2 ways, for example, as 737556964 + 83759104 = 27158^2 + 9152^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19721 + ... + 45072.

It is an arithmetic number, because the mean of its divisors is an integer number (119814905).

Almost surely, 2^821316068 is an apocalyptic number.

It is an amenable number.

821316068 is a deficient number, since it is larger than the sum of its proper divisors (616462792).

821316068 is a wasteful number, since it uses less digits than its factorization.

821316068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67966 (or 67964 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 821316068 is about 28658.6124576889. The cubic root of 821316068 is about 936.4906372233.

The spelling of 821316068 in words is "eight hundred twenty-one million, three hundred sixteen thousand, sixty-eight".