812170522120 has 64 divisors (see below), whose sum is σ = 1841162400000. Its totient is φ = 322424229888.

The previous prime is 812170522109. The next prime is 812170522181. The reversal of 812170522120 is 21225071218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4601256 + ... + 4774504.

It is an arithmetic number, because the mean of its divisors is an integer number (28768162500).

Almost surely, 2^812170522120 is an apocalyptic number.

It is an amenable number.

812170522120 is an abundant number, since it is smaller than the sum of its proper divisors (1028991877880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812170522120 is a wasteful number, since it uses less digits than its factorization.

812170522120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174142 (or 174138 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

Adding to 812170522120 its reverse (21225071218), we get a palindrome (833395593338).

The spelling of 812170522120 in words is "eight hundred twelve billion, one hundred seventy million, five hundred twenty-two thousand, one hundred twenty".