812083455928821 has 32 divisors (see below), whose sum is σ = 1131421840041600. Its totient is φ = 517445893036800.

The previous prime is 812083455928627. The next prime is 812083455928873. The reversal of 812083455928821 is 128829554380218.

It is not a de Polignac number, because 812083455928821 - 2¹¹ = 812083455926773 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812083455928021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37089135 + ... + 54770163.

It is an arithmetic number, because the mean of its divisors is an integer number (35356932501300).

Almost surely, 2^{812083455928821} is an apocalyptic number.

It is an amenable number.

812083455928821 is a deficient number, since it is larger than the sum of its proper divisors (319338384112779).

812083455928821 is a wasteful number, since it uses less digits than its factorization.

812083455928821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17686389.

The product of its (nonzero) digits is 88473600, while the sum is 66.

The spelling of 812083455928821 in words is "eight hundred twelve trillion, eighty-three billion, four hundred fifty-five million, nine hundred twenty-eight thousand, eight hundred twenty-one".