812060821 has 16 divisors (see below), whose sum is σ = 954894528. Its totient is φ = 680832000.

The previous prime is 812060803. The next prime is 812060849. The reversal of 812060821 is 128060218.

It is a cyclic number.

It is not a de Polignac number, because 812060821 - 2¹¹ = 812058773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812060821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812060861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227170 + ... + 230716.

It is an arithmetic number, because the mean of its divisors is an integer number (59680908).

Almost surely, 2^812060821 is an apocalyptic number.

It is an amenable number.

812060821 is a deficient number, since it is larger than the sum of its proper divisors (142833707).

812060821 is a wasteful number, since it uses less digits than its factorization.

812060821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 812060821 is about 28496.6808769021. The cubic root of 812060821 is about 932.9596316702.

The spelling of 812060821 in words is "eight hundred twelve million, sixty thousand, eight hundred twenty-one".