12221222212221 has 64 divisors (see below), whose sum is σ = 18474566400000. Its totient is φ = 7120929888000.

The previous prime is 12221222212217. The next prime is 12221222212231.

It is a happy number.

12221222212221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12221222212221 - 2² = 12221222212217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221222212191 and 12221222212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221222212231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 61437880 + ... + 61636478.

It is an arithmetic number, because the mean of its divisors is an integer number (288665100000).

Almost surely, 2^{12221222212221} is an apocalyptic number.

12221222212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221222212221 is a deficient number, since it is larger than the sum of its proper divisors (6253344187779).

12221222212221 is a wasteful number, since it uses less digits than its factorization.

12221222212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199250.

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

It can be divided in two parts, 1222122 and 2212221, that added together give a palindrome (3434343).

The spelling of 12221222212221 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".