22122032221 has 4 divisors (see below), whose sum is σ = 23423328252. Its totient is φ = 20820736192.

The previous prime is 22122032197. The next prime is 22122032227. The reversal of 22122032221 is 12223022122.

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 16670424996 + 5451607225 = 129114^2 + 73835^2 .

It is a cyclic number.

It is not a de Polignac number, because 22122032221 - 2⁵ = 22122032189 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 (22122032227) 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, 650647990 + ... + 650648023.

It is an arithmetic number, because the mean of its divisors is an integer number (5855832063).

Almost surely, 2^22122032221 is an apocalyptic number.

It is an amenable number.

22122032221 is a deficient number, since it is larger than the sum of its proper divisors (1301296031).

22122032221 is a wasteful number, since it uses less digits than its factorization.

22122032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301296030.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 22122032221 its reverse (12223022122), we get a palindrome (34345054343).

The spelling of 22122032221 in words is "twenty-two billion, one hundred twenty-two million, thirty-two thousand, two hundred twenty-one".