111221101205 has 4 divisors (see below), whose sum is σ = 133465321452. Its totient is φ = 88976880960.

The previous prime is 111221101181. The next prime is 111221101213. The reversal of 111221101205 is 502101122111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502101122111 = 705017 ⋅712183.

It can be written as a sum of positive squares in 2 ways, for example, as 71108622244 + 40112478961 = 266662^2 + 200281^2 .

It is not a de Polignac number, because 111221101205 - 2⁶ = 111221101141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11122110116 + ... + 11122110125.

It is an arithmetic number, because the mean of its divisors is an integer number (33366330363).

Almost surely, 2^111221101205 is an apocalyptic number.

It is an amenable number.

111221101205 is a deficient number, since it is larger than the sum of its proper divisors (22244220247).

111221101205 is an equidigital number, since it uses as much as digits as its factorization.

111221101205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22244220246.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 111221101205 its reverse (502101122111), we get a palindrome (613322223316).

The spelling of 111221101205 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred one thousand, two hundred five".