11222122012121 has 2 divisors, whose sum is σ = 11222122012122. Its totient is φ = 11222122012120.

The previous prime is 11222122012117. The next prime is 11222122012159. The reversal of 11222122012121 is 12121022122211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11016663786496 + 205458225625 = 3319136^2 + 453275^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222122012121 - 2² = 11222122012117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11222122012093 and 11222122012102.

It is not a weakly prime, because it can be changed into another prime (11222122017121) 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, 5611061006060 + 5611061006061.

It is an arithmetic number, because the mean of its divisors is an integer number (5611061006061).

Almost surely, 2^{11222122012121} is an apocalyptic number.

It is an amenable number.

11222122012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222122012121 is an equidigital number, since it uses as much as digits as its factorization.

11222122012121 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 20.

Adding to 11222122012121 its reverse (12121022122211), we get a palindrome (23343144134332).

The spelling of 11222122012121 in words is "eleven trillion, two hundred twenty-two billion, one hundred twenty-two million, twelve thousand, one hundred twenty-one".