22112121221 has 8 divisors (see below), whose sum is σ = 23468719680. Its totient is φ = 20761732288.

The previous prime is 22112121203. The next prime is 22112121233. The reversal of 22112121221 is 12212121122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22112121221 - 2²² = 22107926917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22112121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112121281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545041 + ... + 1559286.

It is an arithmetic number, because the mean of its divisors is an integer number (2933589960).

Almost surely, 2^22112121221 is an apocalyptic number.

It is an amenable number.

22112121221 is a deficient number, since it is larger than the sum of its proper divisors (1356598459).

22112121221 is a wasteful number, since it uses less digits than its factorization.

22112121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104763.

The product of its digits is 64, while the sum is 17.

Adding to 22112121221 its reverse (12212121122), we get a palindrome (34324242343).

Subtracting from 22112121221 its reverse (12212121122), we obtain a palindrome (9900000099).

The spelling of 22112121221 in words is "twenty-two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".