111201221111 has 4 divisors (see below), whose sum is σ = 111202068432. Its totient is φ = 111200373792.

The previous prime is 111201221099. The next prime is 111201221113. The reversal of 111201221111 is 111122102111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111201221111 - 2³⁴ = 94021351927 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 (111201221113) 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, 180146 + ... + 504831.

It is an arithmetic number, because the mean of its divisors is an integer number (27800517108).

Almost surely, 2^111201221111 is an apocalyptic number.

111201221111 is a deficient number, since it is larger than the sum of its proper divisors (847321).

111201221111 is an equidigital number, since it uses as much as digits as its factorization.

111201221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847320.

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

Adding to 111201221111 its reverse (111122102111), we get a palindrome (222323323222).

The spelling of 111201221111 in words is "one hundred eleven billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".