18512211102212 has 24 divisors (see below), whose sum is σ = 32964190828800. Its totient is φ = 9094049250336.

The previous prime is 18512211102197. The next prime is 18512211102241. The reversal of 18512211102212 is 21220111221581.

It is a super-2 number, since 2×18512211102212² (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 21882083 + ... + 22712330.

It is an arithmetic number, because the mean of its divisors is an integer number (1373507951200).

Almost surely, 2^{18512211102212} is an apocalyptic number.

It is an amenable number.

18512211102212 is a deficient number, since it is larger than the sum of its proper divisors (14451979726588).

18512211102212 is a wasteful number, since it uses less digits than its factorization.

18512211102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44596235 (or 44596233 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 29.

Adding to 18512211102212 its reverse (21220111221581), we get a palindrome (39732322323793).

The spelling of 18512211102212 in words is "eighteen trillion, five hundred twelve billion, two hundred eleven million, one hundred two thousand, two hundred twelve".