813220421072 has 20 divisors (see below), whose sum is σ = 1590069748740. Its totient is φ = 402879840768.

The previous prime is 813220421059. The next prime is 813220421081. The reversal of 813220421072 is 270124022318.

It can be written as a sum of positive squares in 2 ways, for example, as 249796041616 + 563424379456 = 499796^2 + 750616^2 .

It is a super-2 number, since 2×813220421072² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233146313 + ... + 233149800.

It is an arithmetic number, because the mean of its divisors is an integer number (79503487437).

Almost surely, 2^813220421072 is an apocalyptic number.

It is an amenable number.

813220421072 is a deficient number, since it is larger than the sum of its proper divisors (776849327668).

813220421072 is a wasteful number, since it uses less digits than its factorization.

813220421072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466296230 (or 466296224 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 813220421072 in words is "eight hundred thirteen billion, two hundred twenty million, four hundred twenty-one thousand, seventy-two".