12123335540 has 48 divisors (see below), whose sum is σ = 26776189440. Its totient is φ = 4604346240.

The previous prime is 12123335519. The next prime is 12123335563. The reversal of 12123335540 is 4553332121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151610 + ... + 217329.

It is an arithmetic number, because the mean of its divisors is an integer number (557837280).

Almost surely, 2^12123335540 is an apocalyptic number.

12123335540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123335540 is an abundant number, since it is smaller than the sum of its proper divisors (14652853900).

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

12123335540 is a wasteful number, since it uses less digits than its factorization.

12123335540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369032 (or 369030 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 12123335540 its reverse (4553332121), we get a palindrome (16676667661).

The spelling of 12123335540 in words is "twelve billion, one hundred twenty-three million, three hundred thirty-five thousand, five hundred forty".