22162221 has 16 divisors (see below), whose sum is σ = 32968320. Its totient is φ = 14713920.

The previous prime is 22162213. The next prime is 22162249. The reversal of 22162221 is 12226122.

22162221 is a `hidden beast` number, since 2 + 21 + 622 + 21 = 666.

It is not a de Polignac number, because 22162221 - 2³ = 22162213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22162194 and 22162203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22162291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5541 + ... + 8661.

It is an arithmetic number, because the mean of its divisors is an integer number (2060520).

Almost surely, 2^22162221 is an apocalyptic number.

It is an amenable number.

22162221 is a deficient number, since it is larger than the sum of its proper divisors (10806099).

22162221 is a wasteful number, since it uses less digits than its factorization.

22162221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393 (or 3387 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 22162221 is about 4707.6768155854. The cubic root of 22162221 is about 280.8909587350.

Adding to 22162221 its reverse (12226122), we get a palindrome (34388343).

The spelling of 22162221 in words is "twenty-two million, one hundred sixty-two thousand, two hundred twenty-one".