22122222221 has 32 divisors (see below), whose sum is σ = 25436160000. Its totient is φ = 19052832960.

The previous prime is 22122222197. The next prime is 22122222229. The reversal of 22122222221 is 12222222122.

It is not a de Polignac number, because 22122222221 - 2³⁴ = 4942353037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122222193 and 22122222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122222229) 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, 17295860 + ... + 17297138.

It is an arithmetic number, because the mean of its divisors is an integer number (794880000).

Almost surely, 2^22122222221 is an apocalyptic number.

It is an amenable number.

22122222221 is a deficient number, since it is larger than the sum of its proper divisors (3313937779).

22122222221 is a wasteful number, since it uses less digits than its factorization.

22122222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297.

The product of its digits is 512, while the sum is 20.

Adding to 22122222221 its reverse (12222222122), we get a palindrome (34344444343).

Subtracting from 22122222221 its reverse (12222222122), we obtain a palindrome (9900000099).

It can be divided in two parts, 22 and 122222221, that multiplied together give a palindrome (2688888862).

The spelling of 22122222221 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".