12105012540 has 24 divisors (see below), whose sum is σ = 33894035280. Its totient is φ = 3228003328.

The previous prime is 12105012529. The next prime is 12105012541. The reversal of 12105012540 is 4521050121.

12105012540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105012541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100875045 + ... + 100875164.

It is an arithmetic number, because the mean of its divisors is an integer number (1412251470).

Almost surely, 2^12105012540 is an apocalyptic number.

12105012540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12105012540 is an abundant number, since it is smaller than the sum of its proper divisors (21789022740).

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

12105012540 is a wasteful number, since it uses less digits than its factorization.

12105012540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201750221 (or 201750219 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 12105012540 its reverse (4521050121), we get a palindrome (16626062661).

The spelling of 12105012540 in words is "twelve billion, one hundred five million, twelve thousand, five hundred forty".