2221202112121 has 2 divisors, whose sum is σ = 2221202112122. Its totient is φ = 2221202112120.

The previous prime is 2221202112109. The next prime is 2221202112169. The reversal of 2221202112121 is 1212112021222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2105006346496 + 116195765625 = 1450864^2 + 340875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221202112121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221202110121) 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, 1110601056060 + 1110601056061.

It is an arithmetic number, because the mean of its divisors is an integer number (1110601056061).

Almost surely, 2^{2221202112121} is an apocalyptic number.

It is an amenable number.

2221202112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221202112121 is an equidigital number, since it uses as much as digits as its factorization.

2221202112121 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 19.

Adding to 2221202112121 its reverse (1212112021222), we get a palindrome (3433314133343).

The spelling of 2221202112121 in words is "two trillion, two hundred twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred twenty-one".