12212222111221 has 16 divisors (see below), whose sum is σ = 13435324718400. Its totient is φ = 11008327478400.

The previous prime is 12212222111213. The next prime is 12212222111233. The reversal of 12212222111221 is 12211122221221.

It is a cyclic number.

It is not a de Polignac number, because 12212222111221 - 2³ = 12212222111213 is a prime.

It is a super-2 number, since 2×12212222111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212222111192 and 12212222111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212222111261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9155616 + ... + 10404313.

It is an arithmetic number, because the mean of its divisors is an integer number (839707794900).

Almost surely, 2^{12212222111221} is an apocalyptic number.

12212222111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212222111221 is a deficient number, since it is larger than the sum of its proper divisors (1223102607179).

12212222111221 is a wasteful number, since it uses less digits than its factorization.

12212222111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19560420.

The product of its digits is 256, while the sum is 22.

Adding to 12212222111221 its reverse (12211122221221), we get a palindrome (24423344332442).

The spelling of 12212222111221 in words is "twelve trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".