111205404121 has 4 divisors (see below), whose sum is σ = 127091890432. Its totient is φ = 95318917812.

The previous prime is 111205404119. The next prime is 111205404203. The reversal of 111205404121 is 121404502111.

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: 121404502111 = 47 ⋅2583074513.

It is a cyclic number.

It is not a de Polignac number, because 111205404121 - 2¹ = 111205404119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111205404092 and 111205404101.

It is not an unprimeable number, because it can be changed into a prime (111205404721) 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, 7943243145 + ... + 7943243158.

It is an arithmetic number, because the mean of its divisors is an integer number (31772972608).

Almost surely, 2^111205404121 is an apocalyptic number.

It is an amenable number.

111205404121 is a deficient number, since it is larger than the sum of its proper divisors (15886486311).

111205404121 is an equidigital number, since it uses as much as digits as its factorization.

111205404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15886486310.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 111205404121 its reverse (121404502111), we get a palindrome (232609906232).

The spelling of 111205404121 in words is "one hundred eleven billion, two hundred five million, four hundred four thousand, one hundred twenty-one".