22222111221 has 24 divisors (see below), whose sum is σ = 34000162560. Its totient is φ = 13937786496.

The previous prime is 22222111199. The next prime is 22222111277. The reversal of 22222111221 is 12211122222.

It is a happy number.

22222111221 is a `hidden beast` number, since 222 + 221 + 1 + 1 + 221 = 666.

It is not a de Polignac number, because 22222111221 - 2²³ = 22213722613 is a prime.

It is a super-2 number, since 2×22222111221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22222111194 and 22222111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222111291) 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, 379516 + ... + 434138.

It is an arithmetic number, because the mean of its divisors is an integer number (1416673440).

Almost surely, 2^22222111221 is an apocalyptic number.

It is an amenable number.

22222111221 is a deficient number, since it is larger than the sum of its proper divisors (11778051339).

22222111221 is a wasteful number, since it uses less digits than its factorization.

22222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57305 (or 57302 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 22222111221 its reverse (12211122222), we get a palindrome (34433233443).

The spelling of 22222111221 in words is "twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".