12100211111221 has 16 divisors (see below), whose sum is σ = 12370785102720. Its totient is φ = 11831956931520.

The previous prime is 12100211111207. The next prime is 12100211111227. The reversal of 12100211111221 is 12211111200121.

It is a cyclic number.

It is not a de Polignac number, because 12100211111221 - 2⁵ = 12100211111189 is a prime.

It is a super-2 number, since 2×12100211111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100211111195 and 12100211111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100211111227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9666871 + ... + 10846603.

It is an arithmetic number, because the mean of its divisors is an integer number (773174068920).

Almost surely, 2^{12100211111221} is an apocalyptic number.

It is an amenable number.

12100211111221 is a deficient number, since it is larger than the sum of its proper divisors (270573991499).

12100211111221 is a wasteful number, since it uses less digits than its factorization.

12100211111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180716.

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

Adding to 12100211111221 its reverse (12211111200121), we get a palindrome (24311322311342).

The spelling of 12100211111221 in words is "twelve trillion, one hundred billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-one".