111112211221111 has 4 divisors (see below), whose sum is σ = 111283945705872. Its totient is φ = 110940476736352.

The previous prime is 111112211221093. The next prime is 111112211221177. The reversal of 111112211221111 is 111122112211111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111112211221111 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112211221511) 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, 85867241410 + ... + 85867242703.

It is an arithmetic number, because the mean of its divisors is an integer number (27820986426468).

Almost surely, 2^{111112211221111} is an apocalyptic number.

111112211221111 is a deficient number, since it is larger than the sum of its proper divisors (171734484761).

111112211221111 is an equidigital number, since it uses as much as digits as its factorization.

111112211221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171734484760.

The product of its digits is 16, while the sum is 19.

Adding to 111112211221111 its reverse (111122112211111), we get a palindrome (222234323432222).

The spelling of 111112211221111 in words is "one hundred eleven trillion, one hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".