812211112218 has 64 divisors (see below), whose sum is σ = 1812543713280. Its totient is φ = 240522849600.

The previous prime is 812211112211. The next prime is 812211112241.

812211112218 is nontrivially palindromic in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812211112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1852363 + ... + 2248481.

It is an arithmetic number, because the mean of its divisors is an integer number (28320995520).

Almost surely, 2^812211112218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812211112218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906271856640).

812211112218 is an abundant number, since it is smaller than the sum of its proper divisors (1000332601062).

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

812211112218 is a wasteful number, since it uses less digits than its factorization.

812211112218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396843.

The product of its digits is 1024, while the sum is 30.

It can be divided in two parts, 812211 and 112218, that added together give a palindrome (924429).

The spelling of 812211112218 in words is "eight hundred twelve billion, two hundred eleven million, one hundred twelve thousand, two hundred eighteen".