1222210110221 has 2 divisors, whose sum is σ = 1222210110222. Its totient is φ = 1222210110220.

The previous prime is 1222210110169. The next prime is 1222210110241. The reversal of 1222210110221 is 1220110122221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 789885450025 + 432324660196 = 888755^2 + 657514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222210110221 - 2¹⁴ = 1222210093837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222210110221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222210110241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611105055110 + 611105055111.

It is an arithmetic number, because the mean of its divisors is an integer number (611105055111).

Almost surely, 2^{1222210110221} is an apocalyptic number.

It is an amenable number.

1222210110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222210110221 is an equidigital number, since it uses as much as digits as its factorization.

1222210110221 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 1222210110221 its reverse (1220110122221), we get a palindrome (2442320232442).

The spelling of 1222210110221 in words is "one trillion, two hundred twenty-two billion, two hundred ten million, one hundred ten thousand, two hundred twenty-one".