22222332221 has 4 divisors (see below), whose sum is σ = 23529528252. Its totient is φ = 20915136192.

The previous prime is 22222332203. The next prime is 22222332239. The reversal of 22222332221 is 12223322222.

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

It is an interprime number because it is at equal distance from previous prime (22222332203) and next prime (22222332239).

It can be written as a sum of positive squares in 2 ways, for example, as 11943211225 + 10279120996 = 109285^2 + 101386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222332221 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 (22222362221) 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, 653597990 + ... + 653598023.

It is an arithmetic number, because the mean of its divisors is an integer number (5882382063).

Almost surely, 2^22222332221 is an apocalyptic number.

It is an amenable number.

22222332221 is a deficient number, since it is larger than the sum of its proper divisors (1307196031).

22222332221 is a wasteful number, since it uses less digits than its factorization.

22222332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307196030.

The product of its digits is 2304, while the sum is 23.

Adding to 22222332221 its reverse (12223322222), we get a palindrome (34445654443).

Subtracting from 22222332221 its reverse (12223322222), we obtain a palindrome (9999009999).

The spelling of 22222332221 in words is "twenty-two billion, two hundred twenty-two million, three hundred thirty-two thousand, two hundred twenty-one".