111112321221 has 24 divisors (see below), whose sum is σ = 175155926400. Its totient is φ = 67313937600.

The previous prime is 111112321213. The next prime is 111112321231. The reversal of 111112321221 is 122123211111.

It is a happy number.

111112321221 is a `hidden beast` number, since 1 + 11 + 112 + 321 + 221 = 666.

It is not a de Polignac number, because 111112321221 - 2³ = 111112321213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111112321194 and 111112321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112321231) 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 23 ways as a sum of consecutive naturals, for example, 26980 + ... + 472178.

It is an arithmetic number, because the mean of its divisors is an integer number (7298163600).

Almost surely, 2^111112321221 is an apocalyptic number.

111112321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111112321221 is a deficient number, since it is larger than the sum of its proper divisors (64043605179).

111112321221 is a wasteful number, since it uses less digits than its factorization.

111112321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447737 (or 447734 counting only the distinct ones).

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

Adding to 111112321221 its reverse (122123211111), we get a palindrome (233235532332).

It can be divided in two parts, 11111 and 2321221, that added together give a palindrome (2332332).

The spelling of 111112321221 in words is "one hundred eleven billion, one hundred twelve million, three hundred twenty-one thousand, two hundred twenty-one".