22112222221 has 4 divisors (see below), whose sum is σ = 22825519744. Its totient is φ = 21398924700.

The previous prime is 22112222219. The next prime is 22112222291. The reversal of 22112222221 is 12222221122.

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 22112222221 - 2¹ = 22112222219 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 (22112222291) 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, 356648715 + ... + 356648776.

It is an arithmetic number, because the mean of its divisors is an integer number (5706379936).

Almost surely, 2^22112222221 is an apocalyptic number.

It is an amenable number.

22112222221 is a deficient number, since it is larger than the sum of its proper divisors (713297523).

22112222221 is an equidigital number, since it uses as much as digits as its factorization.

22112222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713297522.

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

Adding to 22112222221 its reverse (12222221122), we get a palindrome (34334443343).

The spelling of 22112222221 in words is "twenty-two billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".