821313708 has 12 divisors (see below), whose sum is σ = 1916398680. Its totient is φ = 273771232.

The previous prime is 821313667. The next prime is 821313709. The reversal of 821313708 is 807313128.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (821313709) 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, 34221393 + ... + 34221416.

It is an arithmetic number, because the mean of its divisors is an integer number (159699890).

Almost surely, 2^821313708 is an apocalyptic number.

It is an amenable number.

821313708 is an abundant number, since it is smaller than the sum of its proper divisors (1095084972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821313708 is a wasteful number, since it uses less digits than its factorization.

821313708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68442816 (or 68442814 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 821313708 is about 28658.5712833002. The cubic root of 821313708 is about 936.4897402402.

The spelling of 821313708 in words is "eight hundred twenty-one million, three hundred thirteen thousand, seven hundred eight".