821342668 has 12 divisors (see below), whose sum is σ = 1472407272. Its totient is φ = 400654880.

The previous prime is 821342653. The next prime is 821342677. The reversal of 821342668 is 866243128.

821342668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 821342668.

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, 2503930 + ... + 2504257.

It is an arithmetic number, because the mean of its divisors is an integer number (122700606).

Almost surely, 2^821342668 is an apocalyptic number.

It is an amenable number.

821342668 is a deficient number, since it is larger than the sum of its proper divisors (651064604).

821342668 is a wasteful number, since it uses less digits than its factorization.

821342668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008232 (or 5008230 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 821342668 is about 28659.0765378091. The cubic root of 821342668 is about 936.5007471688.

The spelling of 821342668 in words is "eight hundred twenty-one million, three hundred forty-two thousand, six hundred sixty-eight".