12221120011721 has 2 divisors, whose sum is σ = 12221120011722. Its totient is φ = 12221120011720.

The previous prime is 12221120011679. The next prime is 12221120011741. The reversal of 12221120011721 is 12711002112221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10224875988496 + 1996244023225 = 3197636^2 + 1412885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221120011721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221120011741) 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, 6110560005860 + 6110560005861.

It is an arithmetic number, because the mean of its divisors is an integer number (6110560005861).

Almost surely, 2^{12221120011721} is an apocalyptic number.

It is an amenable number.

12221120011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221120011721 is an equidigital number, since it uses as much as digits as its factorization.

12221120011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 12221120011721 its reverse (12711002112221), we get a palindrome (24932122123942).

The spelling of 12221120011721 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty million, eleven thousand, seven hundred twenty-one".