12221211000221 has 2 divisors, whose sum is σ = 12221211000222. Its totient is φ = 12221211000220.

The previous prime is 12221211000203. The next prime is 12221211000263. The reversal of 12221211000221 is 12200011212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11041923597721 + 1179287402500 = 3322939^2 + 1085950^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221211000221 - 2¹⁰ = 12221210999197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12221211000221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221211000721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110605500110 + 6110605500111.

It is an arithmetic number, because the mean of its divisors is an integer number (6110605500111).

Almost surely, 2^{12221211000221} is an apocalyptic number.

It is an amenable number.

12221211000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221211000221 is an equidigital number, since it uses as much as digits as its factorization.

12221211000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12221211000221 its reverse (12200011212221), we get a palindrome (24421222212442).

The spelling of 12221211000221 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one", and thus it is an aban number.