12105043720220 has 96 divisors (see below), whose sum is σ = 27857806441920. Its totient is φ = 4381803970560.

The previous prime is 12105043720163. The next prime is 12105043720241. The reversal of 12105043720220 is 2202734050121.

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 31 ways as a sum of consecutive naturals, for example, 211623944 + ... + 211681136.

It is an arithmetic number, because the mean of its divisors is an integer number (290185483770).

Almost surely, 2^{12105043720220} is an apocalyptic number.

12105043720220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12105043720220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13928903220960).

12105043720220 is an abundant number, since it is smaller than the sum of its proper divisors (15752762721700).

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

12105043720220 is a wasteful number, since it uses less digits than its factorization.

12105043720220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61575 (or 61573 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 12105043720220 its reverse (2202734050121), we get a palindrome (14307777770341).

The spelling of 12105043720220 in words is "twelve trillion, one hundred five billion, forty-three million, seven hundred twenty thousand, two hundred twenty".