12231222213221 has 24 divisors (see below), whose sum is σ = 13684132143864. Its totient is φ = 10921402800000.

The previous prime is 12231222213163. The next prime is 12231222213239.

12231222213221 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 23291032996 + 12207931180225 = 152614^2 + 3493985^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12231222213221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231222213271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3992111 + ... + 6356051.

It is an arithmetic number, because the mean of its divisors is an integer number (570172172661).

Almost surely, 2^{12231222213221} is an apocalyptic number.

12231222213221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12231222213221 is a deficient number, since it is larger than the sum of its proper divisors (1452909930643).

12231222213221 is a wasteful number, since it uses less digits than its factorization.

12231222213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364725 (or 2364714 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

It can be divided in two parts, 1223122 and 2213221, that added together give a palindrome (3436343).

The spelling of 12231222213221 in words is "twelve trillion, two hundred thirty-one billion, two hundred twenty-two million, two hundred thirteen thousand, two hundred twenty-one".