12311123221 has 16 divisors (see below), whose sum is σ = 12935282688. Its totient is φ = 11694641200.

The previous prime is 12311123219. The next prime is 12311123243. The reversal of 12311123221 is 12232111321.

It is a cyclic number.

It is not a de Polignac number, because 12311123221 - 2¹ = 12311123219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311123261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2247516 + ... + 2252986.

It is an arithmetic number, because the mean of its divisors is an integer number (808455168).

Almost surely, 2^12311123221 is an apocalyptic number.

It is an amenable number.

12311123221 is a deficient number, since it is larger than the sum of its proper divisors (624159467).

12311123221 is a wasteful number, since it uses less digits than its factorization.

12311123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152.

The product of its digits is 144, while the sum is 19.

Adding to 12311123221 its reverse (12232111321), we get a palindrome (24543234542).

The spelling of 12311123221 in words is "twelve billion, three hundred eleven million, one hundred twenty-three thousand, two hundred twenty-one".