111211232121 has 16 divisors (see below), whose sum is σ = 179735325120. Its totient is φ = 67400746560.

The previous prime is 111211232113. The next prime is 111211232141. The reversal of 111211232121 is 121232112111.

It is a happy number.

111211232121 is a `hidden beast` number, since 111 + 211 + 2 + 321 + 21 = 666.

It is not a de Polignac number, because 111211232121 - 2³ = 111211232113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211232094 and 111211232103.

It is not an unprimeable number, because it can be changed into a prime (111211232141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187224000 + ... + 187224593.

It is an arithmetic number, because the mean of its divisors is an integer number (11233457820).

Almost surely, 2^111211232121 is an apocalyptic number.

111211232121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111211232121 is a deficient number, since it is larger than the sum of its proper divisors (68524092999).

111211232121 is a wasteful number, since it uses less digits than its factorization.

111211232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374448613 (or 374448607 counting only the distinct ones).

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

Adding to 111211232121 its reverse (121232112111), we get a palindrome (232443344232).

The spelling of 111211232121 in words is "one hundred eleven billion, two hundred eleven million, two hundred thirty-two thousand, one hundred twenty-one".