111110020121221 has 12 divisors (see below), whose sum is σ = 123338395641132. Its totient is φ = 100009019000000.

The previous prime is 111110020121203. The next prime is 111110020121237. The reversal of 111110020121221 is 122121020011111.

It can be written as a sum of positive squares in 2 ways, for example, as 105173434268100 + 5936585853121 = 10255410^2 + 2436511^2 .

It is not a de Polignac number, because 111110020121221 - 2³⁹ = 110560264307333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111110020121195 and 111110020121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110020124221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4545852280 + ... + 4545876721.

It is an arithmetic number, because the mean of its divisors is an integer number (10278199636761).

Almost surely, 2^{111110020121221} is an apocalyptic number.

111110020121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111110020121221 is a deficient number, since it is larger than the sum of its proper divisors (12228375519911).

111110020121221 is a wasteful number, since it uses less digits than its factorization.

111110020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091729124 (or 9091729113 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111110020121221 its reverse (122121020011111), we get a palindrome (233231040132332).

The spelling of 111110020121221 in words is "one hundred eleven trillion, one hundred ten billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".