812221124 has 24 divisors (see below), whose sum is σ = 1669882368. Its totient is φ = 340791840.

The previous prime is 812221117. The next prime is 812221127. The reversal of 812221124 is 421122218.

It is a self number, because there is not a number n which added to its sum of digits gives 812221124.

It is not an unprimeable number, because it can be changed into a prime (812221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709412 + ... + 710555.

It is an arithmetic number, because the mean of its divisors is an integer number (69578432).

Almost surely, 2^812221124 is an apocalyptic number.

It is an amenable number.

812221124 is an abundant number, since it is smaller than the sum of its proper divisors (857661244).

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

812221124 is a wasteful number, since it uses less digits than its factorization.

812221124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419995 (or 1419993 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 812221124 is about 28499.4933990062. The cubic root of 812221124 is about 933.0210172151.

The spelling of 812221124 in words is "eight hundred twelve million, two hundred twenty-one thousand, one hundred twenty-four".