12135511240 has 32 divisors (see below), whose sum is σ = 27678946680. Its totient is φ = 4787707392.

The previous prime is 12135511231. The next prime is 12135511247. The reversal of 12135511240 is 4211553121.

It can be written as a sum of positive squares in 4 ways, for example, as 9825170884 + 2310340356 = 99122^2 + 48066^2 .

It is not an unprimeable number, because it can be changed into a prime (12135511247) 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, 2075079 + ... + 2080918.

Almost surely, 2^12135511240 is an apocalyptic number.

12135511240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12135511240 is an abundant number, since it is smaller than the sum of its proper divisors (15543435440).

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

12135511240 is a wasteful number, since it uses less digits than its factorization.

12135511240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156081 (or 4156077 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 12135511240 in words is "twelve billion, one hundred thirty-five million, five hundred eleven thousand, two hundred forty".