12212112102221 has 2 divisors, whose sum is σ = 12212112102222. Its totient is φ = 12212112102220.

The previous prime is 12212112102163. The next prime is 12212112102271. The reversal of 12212112102221 is 12220121121221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10453873230025 + 1758238872196 = 3233245^2 + 1325986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212112102221 is a prime.

It is a super-2 number, since 2×12212112102221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12212112102193 and 12212112102202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212112102271) 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, 6106056051110 + 6106056051111.

It is an arithmetic number, because the mean of its divisors is an integer number (6106056051111).

Almost surely, 2^{12212112102221} is an apocalyptic number.

It is an amenable number.

12212112102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212112102221 is an equidigital number, since it uses as much as digits as its factorization.

12212112102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12212112102221 its reverse (12220121121221), we get a palindrome (24432233223442).

The spelling of 12212112102221 in words is "twelve trillion, two hundred twelve billion, one hundred twelve million, one hundred two thousand, two hundred twenty-one".