131212223321 has 2 divisors, whose sum is σ = 131212223322. Its totient is φ = 131212223320.

The previous prime is 131212223299. The next prime is 131212223347. The reversal of 131212223321 is 123322212131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126825015625 + 4387207696 = 356125^2 + 66236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131212223321 is a prime.

It is not a weakly prime, because it can be changed into another prime (131212222321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606111660 + 65606111661.

It is an arithmetic number, because the mean of its divisors is an integer number (65606111661).

Almost surely, 2^131212223321 is an apocalyptic number.

It is an amenable number.

131212223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131212223321 is an equidigital number, since it uses as much as digits as its factorization.

131212223321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 131212223321 its reverse (123322212131), we get a palindrome (254534435452).

The spelling of 131212223321 in words is "one hundred thirty-one billion, two hundred twelve million, two hundred twenty-three thousand, three hundred twenty-one".