821000812 has 18 divisors (see below), whose sum is σ = 1461540668. Its totient is φ = 403535928.

The previous prime is 821000809. The next prime is 821000813. The reversal of 821000812 is 218000128.

It is not an unprimeable number, because it can be changed into a prime (821000813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15558 + ... + 43405.

Almost surely, 2^821000812 is an apocalyptic number.

It is an amenable number.

821000812 is a deficient number, since it is larger than the sum of its proper divisors (640539856).

821000812 is a wasteful number, since it uses less digits than its factorization.

821000812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59085 (or 59024 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 821000812 is about 28653.1117332830. Note that the first 3 decimals coincide. The cubic root of 821000812 is about 936.3708002582.

The spelling of 821000812 in words is "eight hundred twenty-one million, eight hundred twelve", and thus it is an aban number.