12111100100221 has 16 divisors (see below), whose sum is σ = 12512384299008. Its totient is φ = 11717579689200.

The previous prime is 12111100100219. The next prime is 12111100100251. The reversal of 12111100100221 is 12200100111121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12111100100221 - 2¹ = 12111100100219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111100100251) 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, 3589125 + ... + 6091306.

It is an arithmetic number, because the mean of its divisors is an integer number (782024018688).

Almost surely, 2^{12111100100221} is an apocalyptic number.

It is an amenable number.

12111100100221 is a deficient number, since it is larger than the sum of its proper divisors (401284198787).

12111100100221 is an equidigital number, since it uses as much as digits as its factorization.

12111100100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9680832.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12111100100221 its reverse (12200100111121), we get a palindrome (24311200211342).

The spelling of 12111100100221 in words is "twelve trillion, one hundred eleven billion, one hundred million, one hundred thousand, two hundred twenty-one".