12222211222221 has 128 divisors (see below), whose sum is σ = 22657423552512. Its totient is φ = 5702394297600.

The previous prime is 12222211222211. The next prime is 12222211222327.

It is a happy number.

12222211222221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12222211222221 - 2⁶ = 12222211222157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12222211222191 and 12222211222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222211222211) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12989886 + ... + 13898976.

It is an arithmetic number, because the mean of its divisors is an integer number (177011121504).

Almost surely, 2^{12222211222221} is an apocalyptic number.

12222211222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222211222221 is a deficient number, since it is larger than the sum of its proper divisors (10435212330291).

12222211222221 is a wasteful number, since it uses less digits than its factorization.

12222211222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909184 (or 909162 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

It can be divided in two parts, 1222221 and 1222221, that added together give a palindrome (2444442).

The spelling of 12222211222221 in words is "twelve trillion, two hundred twenty-two billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".