111121100022221 has 4 divisors (see below), whose sum is σ = 111123109827744. Its totient is φ = 111119090216700.

The previous prime is 111121100022167. The next prime is 111121100022223. The reversal of 111121100022221 is 122220001121111.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111121100022221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111121100022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121100022223) 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, 1004819825 + ... + 1004930406.

It is an arithmetic number, because the mean of its divisors is an integer number (27780777456936).

Almost surely, 2^{111121100022221} is an apocalyptic number.

It is an amenable number.

111121100022221 is a deficient number, since it is larger than the sum of its proper divisors (2009805523).

111121100022221 is an equidigital number, since it uses as much as digits as its factorization.

111121100022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009805522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111121100022221 its reverse (122220001121111), we get a palindrome (233341101143332).

The spelling of 111121100022221 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred million, twenty-two thousand, two hundred twenty-one".