12105500 has 96 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 4200000.

The previous prime is 12105491. The next prime is 12105523. The reversal of 12105500 is 550121.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 170465 + ... + 170535.

It is an arithmetic number, because the mean of its divisors is an integer number (314496).

Almost surely, 2^12105500 is an apocalyptic number.

12105500 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 12105500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15095808).

12105500 is an abundant number, since it is smaller than the sum of its proper divisors (18086116).

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

12105500 is a wasteful number, since it uses less digits than its factorization.

12105500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 12105500 is about 3479.2959057832. The cubic root of 12105500 is about 229.6118215979.

Adding to 12105500 its reverse (550121), we get a palindrome (12655621).

The spelling of 12105500 in words is "twelve million, one hundred five thousand, five hundred".