12221322791 has 2 divisors, whose sum is σ = 12221322792. Its totient is φ = 12221322790.

The previous prime is 12221322761. The next prime is 12221322811. The reversal of 12221322791 is 19722312221.

12221322791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12221322791 - 2¹⁰ = 12221321767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221322731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110661395 + 6110661396.

It is an arithmetic number, because the mean of its divisors is an integer number (6110661396).

Almost surely, 2^12221322791 is an apocalyptic number.

12221322791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221322791 is an equidigital number, since it uses as much as digits as its factorization.

12221322791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The spelling of 12221322791 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-two thousand, seven hundred ninety-one".