12231031221 has 12 divisors (see below), whose sum is σ = 17832159072. Its totient is φ = 8077814376.

The previous prime is 12231031217. The next prime is 12231031223. The reversal of 12231031221 is 12213013221.

12231031221 is a `hidden beast` number, since 1 + 22 + 310 + 312 + 21 = 666.

It is not a de Polignac number, because 12231031221 - 2² = 12231031217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12231031194 and 12231031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231031223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6349521 + ... + 6351446.

It is an arithmetic number, because the mean of its divisors is an integer number (1486013256).

Almost surely, 2^12231031221 is an apocalyptic number.

It is an amenable number.

12231031221 is a deficient number, since it is larger than the sum of its proper divisors (5601127851).

12231031221 is a wasteful number, since it uses less digits than its factorization.

12231031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12701080 (or 12701077 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12231031221 its reverse (12213013221), we get a palindrome (24444044442).

The spelling of 12231031221 in words is "twelve billion, two hundred thirty-one million, thirty-one thousand, two hundred twenty-one".