11111221102121 has 24 divisors (see below), whose sum is σ = 13226302061280. Its totient is φ = 9302125275072.

The previous prime is 11111221102097. The next prime is 11111221102153. The reversal of 11111221102121 is 12120112211111.

It is a de Polignac number, because none of the positive numbers 2^k-11111221102121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11111221102121.

It is not an unprimeable number, because it can be changed into a prime (11111221102181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90406850 + ... + 90529668.

It is an arithmetic number, because the mean of its divisors is an integer number (551095919220).

Almost surely, 2^{11111221102121} is an apocalyptic number.

It is an amenable number.

11111221102121 is a deficient number, since it is larger than the sum of its proper divisors (2115080959159).

11111221102121 is a wasteful number, since it uses less digits than its factorization.

11111221102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165813 (or 165806 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11111221102121 its reverse (12120112211111), we get a palindrome (23231333313232).

The spelling of 11111221102121 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".