12120122100221 has 2 divisors, whose sum is σ = 12120122100222. Its totient is φ = 12120122100220.

The previous prime is 12120122100139. The next prime is 12120122100257. The reversal of 12120122100221 is 12200122102121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11686518288025 + 433603812196 = 3418555^2 + 658486^2 .

It is an emirp because it is prime and its reverse (12200122102121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12120122100221 - 2²⁶ = 12120054991357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12120122100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120122100271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060061050110 + 6060061050111.

It is an arithmetic number, because the mean of its divisors is an integer number (6060061050111).

Almost surely, 2^{12120122100221} is an apocalyptic number.

It is an amenable number.

12120122100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120122100221 is an equidigital number, since it uses as much as digits as its factorization.

12120122100221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12120122100221 its reverse (12200122102121), we get a palindrome (24320244202342).

The spelling of 12120122100221 in words is "twelve trillion, one hundred twenty billion, one hundred twenty-two million, one hundred thousand, two hundred twenty-one".