12101223138 has 32 divisors (see below), whose sum is σ = 24420299904. Its totient is φ = 3997577472.

The previous prime is 12101223137. The next prime is 12101223161. The reversal of 12101223138 is 83132210121.

It is not an unprimeable number, because it can be changed into a prime (12101223133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319756 + ... + 355592.

It is an arithmetic number, because the mean of its divisors is an integer number (763134372).

Almost surely, 2^12101223138 is an apocalyptic number.

12101223138 is an abundant number, since it is smaller than the sum of its proper divisors (12319076766).

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

12101223138 is a wasteful number, since it uses less digits than its factorization.

12101223138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36346.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 12101223138 its reverse (83132210121), we get a palindrome (95233433259).

The spelling of 12101223138 in words is "twelve billion, one hundred one million, two hundred twenty-three thousand, one hundred thirty-eight".