22212212221 has 4 divisors (see below), whose sum is σ = 22214435292. Its totient is φ = 22209989152.

The previous prime is 22212212203. The next prime is 22212212249. The reversal of 22212212221 is 12221221222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11861388100 + 10350824121 = 108910^2 + 101739^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212212221 - 2²⁵ = 22178657789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212212251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096480 + ... + 1116553.

It is an arithmetic number, because the mean of its divisors is an integer number (5553608823).

Almost surely, 2^22212212221 is an apocalyptic number.

It is an amenable number.

22212212221 is a deficient number, since it is larger than the sum of its proper divisors (2223071).

22212212221 is a wasteful number, since it uses less digits than its factorization.

22212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223070.

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

Adding to 22212212221 its reverse (12221221222), we get a palindrome (34433433443).

Subtracting from 22212212221 its reverse (12221221222), we obtain a palindrome (9990990999).

The spelling of 22212212221 in words is "twenty-two billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".