12131221232 has 80 divisors (see below), whose sum is σ = 27264504960. Its totient is φ = 5180910336.

The previous prime is 12131221211. The next prime is 12131221253. The reversal of 12131221232 is 23212213121.

It is an interprime number because it is at equal distance from previous prime (12131221211) and next prime (12131221253).

It is a congruent number.

It is an unprimeable number.

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, 134243 + ... + 205629.

It is an arithmetic number, because the mean of its divisors is an integer number (340806312).

Almost surely, 2^12131221232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12131221232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13632252480).

12131221232 is an abundant number, since it is smaller than the sum of its proper divisors (15133283728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131221232 is a wasteful number, since it uses less digits than its factorization.

12131221232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71470 (or 71464 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 12131221232 its reverse (23212213121), we get a palindrome (35343434353).

The spelling of 12131221232 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty-two".