12100005 has 24 divisors (see below), whose sum is σ = 22208472. Its totient is φ = 6073344.

The previous prime is 12100003. The next prime is 12100057. The reversal of 12100005 is 50000121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4955076 + 7144929 = 2226^2 + 2673^2 .

It is not a de Polignac number, because 12100005 - 2¹ = 12100003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a self number, because there is not a number n which added to its sum of digits gives 12100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7144 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (925353).

Almost surely, 2^12100005 is an apocalyptic number.

12100005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12100005 is a deficient number, since it is larger than the sum of its proper divisors (10108467).

12100005 is a wasteful number, since it uses less digits than its factorization.

12100005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15845 (or 15842 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 12100005 is about 3478.5061448846. The cubic root of 12100005 is about 229.5770740887.

Adding to 12100005 its reverse (50000121), we get a palindrome (62100126).

The spelling of 12100005 in words is "twelve million, one hundred thousand, five".