22122212221 has 8 divisors (see below), whose sum is σ = 23309367200. Its totient is φ = 20937340080.

The previous prime is 22122212213. The next prime is 22122212311. The reversal of 22122212221 is 12221222122.

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 22122212221 - 2³ = 22122212213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122212201) 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 7 ways as a sum of consecutive naturals, for example, 550791 + ... + 589588.

It is an arithmetic number, because the mean of its divisors is an integer number (2913670900).

Almost surely, 2^22122212221 is an apocalyptic number.

It is an amenable number.

22122212221 is a deficient number, since it is larger than the sum of its proper divisors (1187154979).

22122212221 is a wasteful number, since it uses less digits than its factorization.

22122212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141419.

The product of its digits is 256, while the sum is 19.

Adding to 22122212221 its reverse (12221222122), we get a palindrome (34343434343).

Subtracting from 22122212221 its reverse (12221222122), we obtain a palindrome (9900990099).

It can be divided in two parts, 22 and 122212221, that multiplied together give a palindrome (2688668862).

The spelling of 22122212221 in words is "twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".