22112212221 has 32 divisors (see below), whose sum is σ = 35746381440. Its totient is φ = 13397788800.

The previous prime is 22112212219. The next prime is 22112212279. The reversal of 22112212221 is 12221221122.

It is a happy number.

22112212221 is a `hidden beast` number, since 221 + 1 + 221 + 2 + 221 = 666.

It is not a de Polignac number, because 22112212221 - 2¹ = 22112212219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22112212194 and 22112212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112212211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1501731 + ... + 1516383.

It is an arithmetic number, because the mean of its divisors is an integer number (1117074420).

Almost surely, 2^22112212221 is an apocalyptic number.

It is an amenable number.

22112212221 is a deficient number, since it is larger than the sum of its proper divisors (13634169219).

22112212221 is a wasteful number, since it uses less digits than its factorization.

22112212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19754 (or 19748 counting only the distinct ones).

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

Adding to 22112212221 its reverse (12221221122), we get a palindrome (34333433343).

The spelling of 22112212221 in words is "twenty-two billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".