111112212111221 has 4 divisors (see below), whose sum is σ = 111112977813600. Its totient is φ = 111111446408844.

The previous prime is 111112212111209. The next prime is 111112212111239. The reversal of 111112212111221 is 122111212211111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111112212111221 - 2³⁴ = 111095032242037 is a prime.

It is a super-2 number, since 2×111112212111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111112212111193 and 111112212111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112212119221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382633481 + ... + 382923758.

It is an arithmetic number, because the mean of its divisors is an integer number (27778244453400).

Almost surely, 2^{111112212111221} is an apocalyptic number.

It is an amenable number.

111112212111221 is a deficient number, since it is larger than the sum of its proper divisors (765702379).

111112212111221 is an equidigital number, since it uses as much as digits as its factorization.

111112212111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765702378.

The product of its digits is 32, while the sum is 20.

Adding to 111112212111221 its reverse (122111212211111), we get a palindrome (233223424322332).

The spelling of 111112212111221 in words is "one hundred eleven trillion, one hundred twelve billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-one".