11212201222121 has 16 divisors (see below), whose sum is σ = 12060378800640. Its totient is φ = 10399891635840.

The previous prime is 11212201222097. The next prime is 11212201222129. The reversal of 11212201222121 is 12122210221211.

It is not a de Polignac number, because 11212201222121 - 2¹⁰ = 11212201221097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212201222093 and 11212201222102.

It is not an unprimeable number, because it can be changed into a prime (11212201222129) 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 in 15 ways as a sum of consecutive naturals, for example, 45394571 + ... + 45640896.

It is an arithmetic number, because the mean of its divisors is an integer number (753773675040).

Almost surely, 2^{11212201222121} is an apocalyptic number.

It is an amenable number.

11212201222121 is a deficient number, since it is larger than the sum of its proper divisors (848177578519).

11212201222121 is a wasteful number, since it uses less digits than its factorization.

11212201222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91035664.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11212201222121 its reverse (12122210221211), we get a palindrome (23334411443332).

The spelling of 11212201222121 in words is "eleven trillion, two hundred twelve billion, two hundred one million, two hundred twenty-two thousand, one hundred twenty-one".