12312011205 has 64 divisors (see below), whose sum is σ = 24596651520. Its totient is φ = 5797744128.

The previous prime is 12312011203. The next prime is 12312011207. The reversal of 12312011205 is 50211021321.

It is an interprime number because it is at equal distance from previous prime (12312011203) and next prime (12312011207).

It is not a de Polignac number, because 12312011205 - 2¹ = 12312011203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312011203) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 112144 + ... + 192873.

It is an arithmetic number, because the mean of its divisors is an integer number (384322680).

Almost surely, 2^12312011205 is an apocalyptic number.

12312011205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12312011205 is a deficient number, since it is larger than the sum of its proper divisors (12284640315).

12312011205 is a wasteful number, since it uses less digits than its factorization.

12312011205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305067 (or 305061 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 12312011205 its reverse (50211021321), we get a palindrome (62523032526).

The spelling of 12312011205 in words is "twelve billion, three hundred twelve million, eleven thousand, two hundred five".