1112111212221 has 24 divisors (see below), whose sum is σ = 1652822146976. Its totient is φ = 720164481120.

The previous prime is 1112111212213. The next prime is 1112111212231. The reversal of 1112111212221 is 1222121112111.

It is a happy number.

1112111212221 is a `hidden beast` number, since 111 + 211 + 121 + 2 + 221 = 666.

It is not a de Polignac number, because 1112111212221 - 2³ = 1112111212213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1112111212194 and 1112111212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112111212231) 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, 7868275 + ... + 8008368.

Almost surely, 2^{1112111212221} is an apocalyptic number.

It is an amenable number.

1112111212221 is a deficient number, since it is larger than the sum of its proper divisors (540710934755).

1112111212221 is a wasteful number, since it uses less digits than its factorization.

1112111212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15876873 (or 15876870 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1112111212221 its reverse (1222121112111), we get a palindrome (2334232324332).

The spelling of 1112111212221 in words is "one trillion, one hundred twelve billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".