2204121221 has 2 divisors, whose sum is σ = 2204121222. Its totient is φ = 2204121220.

The previous prime is 2204121197. The next prime is 2204121289. The reversal of 2204121221 is 1221214022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1829272900 + 374848321 = 42770^2 + 19361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2204121221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2204121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2204121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102060610 + 1102060611.

It is an arithmetic number, because the mean of its divisors is an integer number (1102060611).

Almost surely, 2^2204121221 is an apocalyptic number.

It is an amenable number.

2204121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2204121221 is an equidigital number, since it uses as much as digits as its factorization.

2204121221 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.

The square root of 2204121221 is about 46948.0694065262. The cubic root of 2204121221 is about 1301.4030652325.

Adding to 2204121221 its reverse (1221214022), we get a palindrome (3425335243).

The spelling of 2204121221 in words is "two billion, two hundred four million, one hundred twenty-one thousand, two hundred twenty-one".