12131023440 has 40 divisors (see below), whose sum is σ = 37606173408. Its totient is φ = 3234939520.

The previous prime is 12131023439. The next prime is 12131023441. The reversal of 12131023440 is 4432013121.

It is an interprime number because it is at equal distance from previous prime (12131023439) and next prime (12131023441).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131023441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25272726 + ... + 25273205.

Almost surely, 2^12131023440 is an apocalyptic number.

12131023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131023440 is an abundant number, since it is smaller than the sum of its proper divisors (25475149968).

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

12131023440 is a wasteful number, since it uses less digits than its factorization.

12131023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50545947 (or 50545941 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 12131023440 its reverse (4432013121), we get a palindrome (16563036561).

The spelling of 12131023440 in words is "twelve billion, one hundred thirty-one million, twenty-three thousand, four hundred forty".