31221111112291 has 2 divisors, whose sum is σ = 31221111112292. Its totient is φ = 31221111112290.

The previous prime is 31221111112207. The next prime is 31221111112397. The reversal of 31221111112291 is 19221111112213.

It is a weak prime.

It is an emirp because it is prime and its reverse (19221111112213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221111112291 is a prime.

It is a super-2 number, since 2×31221111112291² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31221111112691) 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, 15610555556145 + 15610555556146.

It is an arithmetic number, because the mean of its divisors is an integer number (15610555556146).

Almost surely, 2^{31221111112291} is an apocalyptic number.

31221111112291 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221111112291 is an equidigital number, since it uses as much as digits as its factorization.

31221111112291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 28.

The spelling of 31221111112291 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred ninety-one".