111131320210121 has 4 divisors (see below), whose sum is σ = 111132055099332. Its totient is φ = 111130585320912.

The previous prime is 111131320210109. The next prime is 111131320210129. The reversal of 111131320210121 is 121012023131111.

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 104286189867721 + 6845130342400 = 10212061^2 + 2616320^2 .

It is a cyclic number.

It is not a de Polignac number, because 111131320210121 - 2²⁶ = 111131253101257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111131320210093 and 111131320210102.

It is not an unprimeable number, because it can be changed into a prime (111131320210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367217726 + ... + 367520231.

It is an arithmetic number, because the mean of its divisors is an integer number (27783013774833).

Almost surely, 2^{111131320210121} is an apocalyptic number.

It is an amenable number.

111131320210121 is a deficient number, since it is larger than the sum of its proper divisors (734889211).

111131320210121 is an equidigital number, since it uses as much as digits as its factorization.

111131320210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734889210.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 111131320210121 its reverse (121012023131111), we get a palindrome (232143343341232).

The spelling of 111131320210121 in words is "one hundred eleven trillion, one hundred thirty-one billion, three hundred twenty million, two hundred ten thousand, one hundred twenty-one".