111011111222121 has 24 divisors (see below), whose sum is σ = 174926931472800. Its totient is φ = 67279333665600.

The previous prime is 111011111222087. The next prime is 111011111222161. The reversal of 111011111222121 is 121222111110111.

It is not a de Polignac number, because 111011111222121 - 2¹⁹ = 111011110697833 is a prime.

It is a super-3 number, since 3×111011111222121³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111011111222094 and 111011111222103.

It is not an unprimeable number, because it can be changed into a prime (111011111222161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94468030 + ... + 95635928.

It is an arithmetic number, because the mean of its divisors is an integer number (7288622144700).

Almost surely, 2^{111011111222121} is an apocalyptic number.

111011111222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111011111222121 is a deficient number, since it is larger than the sum of its proper divisors (63915820250679).

111011111222121 is a wasteful number, since it uses less digits than its factorization.

111011111222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128037 (or 2128034 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111011111222121 its reverse (121222111110111), we get a palindrome (232233222332232).

The spelling of 111011111222121 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".