1222220102221 has 2 divisors, whose sum is σ = 1222220102222. Its totient is φ = 1222220102220.

The previous prime is 1222220102177. The next prime is 1222220102267. The reversal of 1222220102221 is 1222010222221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058458246596 + 163761855625 = 1028814^2 + 404675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222220102221 - 2¹¹ = 1222220100173 is a prime.

It is a super-2 number, since 2×1222220102221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222220109221) 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, 611110051110 + 611110051111.

It is an arithmetic number, because the mean of its divisors is an integer number (611110051111).

Almost surely, 2^{1222220102221} is an apocalyptic number.

It is an amenable number.

1222220102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222220102221 is an equidigital number, since it uses as much as digits as its factorization.

1222220102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1222220102221 its reverse (1222010222221), we get a palindrome (2444230324442).

The spelling of 1222220102221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, one hundred two thousand, two hundred twenty-one".