12331211221 has 4 divisors (see below), whose sum is σ = 14092812832. Its totient is φ = 10569609612.

The previous prime is 12331211213. The next prime is 12331211251. The reversal of 12331211221 is 12211213321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12211213321 = 1301 ⋅9386021.

It is a cyclic number.

It is not a de Polignac number, because 12331211221 - 2³ = 12331211213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331211251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880800795 + ... + 880800808.

It is an arithmetic number, because the mean of its divisors is an integer number (3523203208).

Almost surely, 2^12331211221 is an apocalyptic number.

It is an amenable number.

12331211221 is a deficient number, since it is larger than the sum of its proper divisors (1761601611).

12331211221 is an equidigital number, since it uses as much as digits as its factorization.

12331211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761601610.

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

Adding to 12331211221 its reverse (12211213321), we get a palindrome (24542424542).

The spelling of 12331211221 in words is "twelve billion, three hundred thirty-one million, two hundred eleven thousand, two hundred twenty-one".