111121102022221 has 4 divisors (see below), whose sum is σ = 113217726588732. Its totient is φ = 109024477455712.

The previous prime is 111121102022141. The next prime is 111121102022243. The reversal of 111121102022221 is 122220201121111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 85150724121225 + 25970377900996 = 9227715^2 + 5096114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111121102022221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121402022221) 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, 1048312283176 + ... + 1048312283281.

It is an arithmetic number, because the mean of its divisors is an integer number (28304431647183).

Almost surely, 2^{111121102022221} is an apocalyptic number.

It is an amenable number.

111121102022221 is a deficient number, since it is larger than the sum of its proper divisors (2096624566511).

111121102022221 is an equidigital number, since it uses as much as digits as its factorization.

111121102022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096624566510.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111121102022221 its reverse (122220201121111), we get a palindrome (233341303143332).

The spelling of 111121102022221 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred two million, twenty-two thousand, two hundred twenty-one".