12111102221 has 4 divisors (see below), whose sum is σ = 12316375200. Its totient is φ = 11905829244.

The previous prime is 12111102193. The next prime is 12111102247. The reversal of 12111102221 is 12220111121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12220111121 = 131 ⋅93283291.

It is a de Polignac number, because none of the positive numbers 2^k-12111102221 is a prime.

It is a super-2 number, since 2×12111102221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12111102196 and 12111102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111102281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102636401 + ... + 102636518.

It is an arithmetic number, because the mean of its divisors is an integer number (3079093800).

Almost surely, 2^12111102221 is an apocalyptic number.

It is an amenable number.

12111102221 is a deficient number, since it is larger than the sum of its proper divisors (205272979).

12111102221 is an equidigital number, since it uses as much as digits as its factorization.

12111102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205272978.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111102221 its reverse (12220111121), we get a palindrome (24331213342).

The spelling of 12111102221 in words is "twelve billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".