22112221221 has 12 divisors (see below), whose sum is σ = 32076959148. Its totient is φ = 14678211264.

The previous prime is 22112221217. The next prime is 22112221231. The reversal of 22112221221 is 12212221122.

It is a happy number.

22112221221 is a `hidden beast` number, since 221 + 1 + 2 + 221 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4259520225 + 17852700996 = 65265^2 + 133614^2 .

It is not a de Polignac number, because 22112221221 - 2² = 22112221217 is a prime.

It is a super-3 number, since 3×22112221221³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22112221194 and 22112221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112221231) 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 11 ways as a sum of consecutive naturals, for example, 5270250 + ... + 5274443.

It is an arithmetic number, because the mean of its divisors is an integer number (2673079929).

Almost surely, 2^22112221221 is an apocalyptic number.

It is an amenable number.

22112221221 is a deficient number, since it is larger than the sum of its proper divisors (9964737927).

22112221221 is a wasteful number, since it uses less digits than its factorization.

22112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544932 (or 10544929 counting only the distinct ones).

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

Adding to 22112221221 its reverse (12212221122), we get a palindrome (34324442343).

Subtracting from 22112221221 its reverse (12212221122), we obtain a palindrome (9900000099).

The spelling of 22112221221 in words is "twenty-two billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".