12131324043221 has 2 divisors, whose sum is σ = 12131324043222. Its totient is φ = 12131324043220.

The previous prime is 12131324043197. The next prime is 12131324043263. The reversal of 12131324043221 is 12234042313121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10692991560196 + 1438332483025 = 3270014^2 + 1199305^2 .

It is an emirp because it is prime and its reverse (12234042313121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12131324043221 - 2¹⁴ = 12131324026837 is a prime.

It is a super-2 number, since 2×12131324043221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12131324003221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065662021610 + 6065662021611.

It is an arithmetic number, because the mean of its divisors is an integer number (6065662021611).

Almost surely, 2^{12131324043221} is an apocalyptic number.

It is an amenable number.

12131324043221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131324043221 is an equidigital number, since it uses as much as digits as its factorization.

12131324043221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 12131324043221 its reverse (12234042313121), we get a palindrome (24365366356342).

The spelling of 12131324043221 in words is "twelve trillion, one hundred thirty-one billion, three hundred twenty-four million, forty-three thousand, two hundred twenty-one".