111102211221 has 4 divisors (see below), whose sum is σ = 148136281632. Its totient is φ = 74068140812.

The previous prime is 111102211211. The next prime is 111102211243. The reversal of 111102211221 is 122112201111.

It is a happy number.

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: 122112201111 = 3 ⋅40704067037.

It is a cyclic number.

It is not a de Polignac number, because 111102211221 - 2¹⁷ = 111102080149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111102211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102211211) 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, 18517035201 + ... + 18517035206.

It is an arithmetic number, because the mean of its divisors is an integer number (37034070408).

Almost surely, 2^111102211221 is an apocalyptic number.

It is an amenable number.

111102211221 is a deficient number, since it is larger than the sum of its proper divisors (37034070411).

111102211221 is an equidigital number, since it uses as much as digits as its factorization.

111102211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37034070410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111102211221 its reverse (122112201111), we get a palindrome (233214412332).

The spelling of 111102211221 in words is "one hundred eleven billion, one hundred two million, two hundred eleven thousand, two hundred twenty-one".