1112112211221 has 24 divisors (see below), whose sum is σ = 1752466584960. Its totient is φ = 673989192000.

The previous prime is 1112112211211. The next prime is 1112112211253. The reversal of 1112112211221 is 1221122112111.

It is a happy number.

1112112211221 is a `hidden beast` number, since 1 + 11 + 211 + 221 + 1 + 221 = 666.

It is not a de Polignac number, because 1112112211221 - 2¹³ = 1112112203029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1112112211194 and 1112112211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112112211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4141785 + ... + 4402113.

It is an arithmetic number, because the mean of its divisors is an integer number (73019441040).

Almost surely, 2^{1112112211221} is an apocalyptic number.

1112112211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1112112211221 is a deficient number, since it is larger than the sum of its proper divisors (640354373739).

1112112211221 is a wasteful number, since it uses less digits than its factorization.

1112112211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303497 (or 303494 counting only the distinct ones).

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

Adding to 1112112211221 its reverse (1221122112111), we get a palindrome (2333234323332).

The spelling of 1112112211221 in words is "one trillion, one hundred twelve billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".