111111102221 has 4 divisors (see below), whose sum is σ = 126984116832. Its totient is φ = 95238087612.

The previous prime is 111111102199. The next prime is 111111102227. The reversal of 111111102221 is 122201111111.

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: 122201111111 = 397 ⋅307811363.

It is a cyclic number.

It is not a de Polignac number, because 111111102221 - 2¹⁰ = 111111101197 is a prime.

It is a super-2 number, since 2×111111102221² (a number of 23 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 = 111111102196 and 111111102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111102227) 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, 7936507295 + ... + 7936507308.

It is an arithmetic number, because the mean of its divisors is an integer number (31746029208).

Almost surely, 2^111111102221 is an apocalyptic number.

It is an amenable number.

111111102221 is a deficient number, since it is larger than the sum of its proper divisors (15873014611).

111111102221 is an equidigital number, since it uses as much as digits as its factorization.

111111102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873014610.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111111102221 its reverse (122201111111), we get a palindrome (233312213332).

The spelling of 111111102221 in words is "one hundred eleven billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".