31112221333321 has 2 divisors, whose sum is σ = 31112221333322. Its totient is φ = 31112221333320.

The previous prime is 31112221333309. The next prime is 31112221333331. The reversal of 31112221333321 is 12333312221113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21197506605625 + 9914714727696 = 4604075^2 + 3148764^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112221333321 - 2⁹ = 31112221332809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31112221333321.

It is not a weakly prime, because it can be changed into another prime (31112221333331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556110666660 + 15556110666661.

It is an arithmetic number, because the mean of its divisors is an integer number (15556110666661).

Almost surely, 2^{31112221333321} is an apocalyptic number.

It is an amenable number.

31112221333321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112221333321 is an equidigital number, since it uses as much as digits as its factorization.

31112221333321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

Adding to 31112221333321 its reverse (12333312221113), we get a palindrome (43445533554434).

The spelling of 31112221333321 in words is "thirty-one trillion, one hundred twelve billion, two hundred twenty-one million, three hundred thirty-three thousand, three hundred twenty-one".