111312221121 has 12 divisors (see below), whose sum is σ = 170242220772. Its totient is φ = 69842962176.

The previous prime is 111312221113. The next prime is 111312221159. The reversal of 111312221121 is 121122213111.

It is a happy number.

111312221121 is a `hidden beast` number, since 1 + 11 + 312 + 221 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 84689730225 + 26622490896 = 291015^2 + 163164^2 .

It is not a de Polignac number, because 111312221121 - 2³ = 111312221113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111312221094 and 111312221103.

It is not an unprimeable number, because it can be changed into a prime (111312221161) 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, 363765276 + ... + 363765581.

It is an arithmetic number, because the mean of its divisors is an integer number (14186851731).

Almost surely, 2^111312221121 is an apocalyptic number.

It is an amenable number.

111312221121 is a deficient number, since it is larger than the sum of its proper divisors (58929999651).

111312221121 is a wasteful number, since it uses less digits than its factorization.

111312221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727530880 (or 727530877 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 111312221121 its reverse (121122213111), we get a palindrome (232434434232).

The spelling of 111312221121 in words is "one hundred eleven billion, three hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".