12131344644 has 24 divisors (see below), whose sum is σ = 28453141920. Its totient is φ = 4022828544.

The previous prime is 12131344633. The next prime is 12131344661. The reversal of 12131344644 is 44644313121.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2616714 + ... + 2621345.

It is an arithmetic number, because the mean of its divisors is an integer number (1185547580).

Almost surely, 2^12131344644 is an apocalyptic number.

It is an amenable number.

12131344644 is an abundant number, since it is smaller than the sum of its proper divisors (16321797276).

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

12131344644 is a wasteful number, since it uses less digits than its factorization.

12131344644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238259 (or 5238257 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

Adding to 12131344644 its reverse (44644313121), we get a palindrome (56775657765).

The spelling of 12131344644 in words is "twelve billion, one hundred thirty-one million, three hundred forty-four thousand, six hundred forty-four".