12222111221221 has 4 divisors (see below), whose sum is σ = 13333212241344. Its totient is φ = 11111010201100.

The previous prime is 12222111221191. The next prime is 12222111221237. The reversal of 12222111221221 is 12212211122221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12222111221221 - 2⁵ = 12222111221189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222111221192 and 12222111221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222111221821) 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 3 ways as a sum of consecutive naturals, for example, 555550510045 + ... + 555550510066.

It is an arithmetic number, because the mean of its divisors is an integer number (3333303060336).

Almost surely, 2^{12222111221221} is an apocalyptic number.

12222111221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222111221221 is a deficient number, since it is larger than the sum of its proper divisors (1111101020123).

12222111221221 is a wasteful number, since it uses less digits than its factorization.

12222111221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111101020122.

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

Adding to 12222111221221 its reverse (12212211122221), we get a palindrome (24434322343442).

The spelling of 12222111221221 in words is "twelve trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".