812413630821 has 16 divisors (see below), whose sum is σ = 1175728031744. Its totient is φ = 496010257344.

The previous prime is 812413630813. The next prime is 812413630841. The reversal of 812413630821 is 128036314218.

812413630821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 812413630821 - 2³ = 812413630813 is a prime.

It is a super-2 number, since 2×812413630821² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 812413630821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812413630841) 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, 82007326 + ... + 82017231.

It is an arithmetic number, because the mean of its divisors is an integer number (73483001984).

Almost surely, 2^812413630821 is an apocalyptic number.

It is an amenable number.

812413630821 is a deficient number, since it is larger than the sum of its proper divisors (363314400923).

812413630821 is a wasteful number, since it uses less digits than its factorization.

812413630821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164024700.

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 812413630821 in words is "eight hundred twelve billion, four hundred thirteen million, six hundred thirty thousand, eight hundred twenty-one".