22222022221 has 4 divisors (see below), whose sum is σ = 25396596832. Its totient is φ = 19047447612.

The previous prime is 22222022219. The next prime is 22222022233. The reversal of 22222022221 is 12222022222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22222022221 - 2¹ = 22222022219 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 (22222022021) 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, 1587287295 + ... + 1587287308.

It is an arithmetic number, because the mean of its divisors is an integer number (6349149208).

Almost surely, 2^22222022221 is an apocalyptic number.

It is an amenable number.

22222022221 is a deficient number, since it is larger than the sum of its proper divisors (3174574611).

22222022221 is an equidigital number, since it uses as much as digits as its factorization.

22222022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174574610.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 22222022221 its reverse (12222022222), we get a palindrome (34444044443).

Subtracting from 22222022221 its reverse (12222022222), we obtain a palindrome (9999999999).

The spelling of 22222022221 in words is "twenty-two billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty-one".