2222111001221 has 2 divisors, whose sum is σ = 2222111001222. Its totient is φ = 2222111001220.

The previous prime is 2222111001197. The next prime is 2222111001233. The reversal of 2222111001221 is 1221001112222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1814371284196 + 407739717025 = 1346986^2 + 638545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222111001221 - 2⁶ = 2222111001157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2222111001221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222111001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111055500610 + 1111055500611.

It is an arithmetic number, because the mean of its divisors is an integer number (1111055500611).

Almost surely, 2^{2222111001221} is an apocalyptic number.

It is an amenable number.

2222111001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222111001221 is an equidigital number, since it uses as much as digits as its factorization.

2222111001221 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 2222111001221 its reverse (1221001112222), we get a palindrome (3443112113443).

The spelling of 2222111001221 in words is "two trillion, two hundred twenty-two billion, one hundred eleven million, one thousand, two hundred twenty-one".