12221202221 has 2 divisors, whose sum is σ = 12221202222. Its totient is φ = 12221202220.

The previous prime is 12221202187. The next prime is 12221202269. The reversal of 12221202221 is 12220212221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11276316100 + 944886121 = 106190^2 + 30739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221202221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12221202221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221202281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110601110 + 6110601111.

It is an arithmetic number, because the mean of its divisors is an integer number (6110601111).

Almost surely, 2^12221202221 is an apocalyptic number.

It is an amenable number.

12221202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221202221 is an equidigital number, since it uses as much as digits as its factorization.

12221202221 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 17.

Adding to 12221202221 its reverse (12220212221), we get a palindrome (24441414442).

The spelling of 12221202221 in words is "twelve billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty-one".