222112111221 has 144 divisors (see below), whose sum is σ = 450309944448. Its totient is φ = 103627641600.

The previous prime is 222112111213. The next prime is 222112111237. The reversal of 222112111221 is 122111211222.

222112111221 is a `hidden beast` number, since 22 + 211 + 211 + 1 + 221 = 666.

It is not a de Polignac number, because 222112111221 - 2³ = 222112111213 is a prime.

It is a super-2 number, since 2×222112111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222112111194 and 222112111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112111241) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2285736 + ... + 2380926.

It is an arithmetic number, because the mean of its divisors is an integer number (3127152392).

Almost surely, 2^222112111221 is an apocalyptic number.

222112111221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222112111221 is an abundant number, since it is smaller than the sum of its proper divisors (228197833227).

222112111221 is a wasteful number, since it uses less digits than its factorization.

222112111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95272 (or 95262 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 222112111221 its reverse (122111211222), we get a palindrome (344223322443).

It can be divided in two parts, 222112 and 111221, that added together give a palindrome (333333).

The spelling of 222112111221 in words is "two hundred twenty-two billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".