11221211022121 has 2 divisors, whose sum is σ = 11221211022122. Its totient is φ = 11221211022120.

The previous prime is 11221211022089. The next prime is 11221211022163. The reversal of 11221211022121 is 12122011212211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9117144730521 + 2104066291600 = 3019461^2 + 1450540^2 .

It is an emirp because it is prime and its reverse (12122011212211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11221211022121 - 2⁵ = 11221211022089 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221211022521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610605511060 + 5610605511061.

It is an arithmetic number, because the mean of its divisors is an integer number (5610605511061).

Almost surely, 2^{11221211022121} is an apocalyptic number.

It is an amenable number.

11221211022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221211022121 is an equidigital number, since it uses as much as digits as its factorization.

11221211022121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11221211022121 its reverse (12122011212211), we get a palindrome (23343222234332).

The spelling of 11221211022121 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, twenty-two thousand, one hundred twenty-one".