11201221008121 has 2 divisors, whose sum is σ = 11201221008122. Its totient is φ = 11201221008120.

The previous prime is 11201221008119. The next prime is 11201221008193. The reversal of 11201221008121 is 12180012210211.

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., 11189326052025 + 11894956096 = 3345045^2 + 109064^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201221008121 - 2¹ = 11201221008119 is a prime.

Together with 11201221008119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11201221008092 and 11201221008101.

It is not a weakly prime, because it can be changed into another prime (11201221008101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600610504060 + 5600610504061.

It is an arithmetic number, because the mean of its divisors is an integer number (5600610504061).

Almost surely, 2^{11201221008121} is an apocalyptic number.

It is an amenable number.

11201221008121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11201221008121 is an equidigital number, since it uses as much as digits as its factorization.

11201221008121 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 22.

Adding to 11201221008121 its reverse (12180012210211), we get a palindrome (23381233218332).

The spelling of 11201221008121 in words is "eleven trillion, two hundred one billion, two hundred twenty-one million, eight thousand, one hundred twenty-one".