12111221022 has 32 divisors (see below), whose sum is σ = 25737979392. Its totient is φ = 3786163584.

The previous prime is 12111221009. The next prime is 12111221033. The reversal of 12111221022 is 22012211121.

It is a junction number, because it is equal to n+sod(n) for n = 12111220992 and 12111221010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180918 + ... + 238649.

It is an arithmetic number, because the mean of its divisors is an integer number (804311856).

Almost surely, 2^12111221022 is an apocalyptic number.

12111221022 is an abundant number, since it is smaller than the sum of its proper divisors (13626758370).

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

12111221022 is a wasteful number, since it uses less digits than its factorization.

12111221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419872.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12111221022 its reverse (22012211121), we get a palindrome (34123432143).

Subtracting 12111221022 from its reverse (22012211121), we obtain a palindrome (9900990099).

The spelling of 12111221022 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, twenty-two".