12131112240 has 120 divisors (see below), whose sum is σ = 43874223120. Its totient is φ = 2986117632.

The previous prime is 12131112223. The next prime is 12131112247. The reversal of 12131112240 is 4221113121.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12131112247) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 638670 + ... + 657389.

It is an arithmetic number, because the mean of its divisors is an integer number (365618526).

Almost surely, 2^12131112240 is an apocalyptic number.

12131112240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131112240 is an abundant number, since it is smaller than the sum of its proper divisors (31743110880).

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

12131112240 is a wasteful number, since it uses less digits than its factorization.

12131112240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296091 (or 1296082 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 12131112240 its reverse (4221113121), we get a palindrome (16352225361).

The spelling of 12131112240 in words is "twelve billion, one hundred thirty-one million, one hundred twelve thousand, two hundred forty".