111173126221 has 4 divisors (see below), whose sum is σ = 111250925500. Its totient is φ = 111095326944.

The previous prime is 111173126171. The next prime is 111173126231. The reversal of 111173126221 is 122621371111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122621371111 = 83 ⋅1477365917.

It can be written as a sum of positive squares in 2 ways, for example, as 54440555625 + 56732570596 = 233325^2 + 238186^2 .

It is a cyclic number.

It is not a de Polignac number, because 111173126221 - 2⁷ = 111173126093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111173126221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111173126231) by changing a digit.

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, 38897496 + ... + 38900353.

It is an arithmetic number, because the mean of its divisors is an integer number (27812731375).

Almost surely, 2^111173126221 is an apocalyptic number.

It is an amenable number.

111173126221 is a deficient number, since it is larger than the sum of its proper divisors (77799279).

111173126221 is an equidigital number, since it uses as much as digits as its factorization.

111173126221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77799278.

The product of its digits is 1008, while the sum is 28.

Adding to 111173126221 its reverse (122621371111), we get a palindrome (233794497332).

The spelling of 111173126221 in words is "one hundred eleven billion, one hundred seventy-three million, one hundred twenty-six thousand, two hundred twenty-one".