12131005240 has 32 divisors (see below), whose sum is σ = 28731330000. Its totient is φ = 4597012224.

The previous prime is 12131005213. The next prime is 12131005309. The reversal of 12131005240 is 4250013121.

It is a super-2 number, since 2×12131005240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7980165 + ... + 7981684.

Almost surely, 2^12131005240 is an apocalyptic number.

12131005240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131005240 is an abundant number, since it is smaller than the sum of its proper divisors (16600324760).

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

12131005240 is a wasteful number, since it uses less digits than its factorization.

12131005240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15961879 (or 15961875 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 12131005240 its reverse (4250013121), we get a palindrome (16381018361).

The spelling of 12131005240 in words is "twelve billion, one hundred thirty-one million, five thousand, two hundred forty".