12312121110 has 32 divisors (see below), whose sum is σ = 30347717472. Its totient is φ = 3194496000.

The previous prime is 12312121093. The next prime is 12312121139. The reversal of 12312121110 is 1112121321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12312121110.

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 15 ways as a sum of consecutive naturals, for example, 5544891 + ... + 5547110.

It is an arithmetic number, because the mean of its divisors is an integer number (948366171).

Almost surely, 2^12312121110 is an apocalyptic number.

12312121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12312121110 is an abundant number, since it is smaller than the sum of its proper divisors (18035596362).

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

12312121110 is a wasteful number, since it uses less digits than its factorization.

12312121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11092048.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12312121110 its reverse (1112121321), we get a palindrome (13424242431).

The spelling of 12312121110 in words is "twelve billion, three hundred twelve million, one hundred twenty-one thousand, one hundred ten".