12131212223 has 16 divisors (see below), whose sum is σ = 14039353440. Its totient is φ = 10382017536.

The previous prime is 12131212217. The next prime is 12131212277. The reversal of 12131212223 is 32221213121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12131212223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12131212195 and 12131212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131218223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394838 + ... + 424451.

It is an arithmetic number, because the mean of its divisors is an integer number (877459590).

Almost surely, 2^12131212223 is an apocalyptic number.

12131212223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12131212223 is a deficient number, since it is larger than the sum of its proper divisors (1908141217).

12131212223 is a wasteful number, since it uses less digits than its factorization.

12131212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819386.

The product of its digits is 288, while the sum is 20.

Adding to 12131212223 its reverse (32221213121), we get a palindrome (44352425344).

The spelling of 12131212223 in words is "twelve billion, one hundred thirty-one million, two hundred twelve thousand, two hundred twenty-three".