2211222012121 has 2 divisors, whose sum is σ = 2211222012122. Its totient is φ = 2211222012120.

The previous prime is 2211222012107. The next prime is 2211222012127. The reversal of 2211222012121 is 1212102221122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2203576958025 + 7645054096 = 1484445^2 + 87436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211222012121 - 2³⁹ = 1661466198233 is a prime.

It is not a weakly prime, because it can be changed into another prime (2211222012127) 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, 1105611006060 + 1105611006061.

It is an arithmetic number, because the mean of its divisors is an integer number (1105611006061).

Almost surely, 2^{2211222012121} is an apocalyptic number.

It is an amenable number.

2211222012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211222012121 is an equidigital number, since it uses as much as digits as its factorization.

2211222012121 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 2211222012121 its reverse (1212102221122), we get a palindrome (3423324233243).

The spelling of 2211222012121 in words is "two trillion, two hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".