22207221 has 12 divisors (see below), whose sum is σ = 32823648. Its totient is φ = 14460264.

The previous prime is 22207193. The next prime is 22207223. The reversal of 22207221 is 12270222.

It is a happy number.

It is not a de Polignac number, because 22207221 - 2⁵ = 22207189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22207194 and 22207203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22207223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28305 + ... + 29078.

It is an arithmetic number, because the mean of its divisors is an integer number (2735304).

Almost surely, 2^22207221 is an apocalyptic number.

It is an amenable number.

22207221 is a deficient number, since it is larger than the sum of its proper divisors (10616427).

22207221 is a wasteful number, since it uses less digits than its factorization.

22207221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57432 (or 57429 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22207221 is about 4712.4538194024. The cubic root of 22207221 is about 281.0809449225.

Adding to 22207221 its reverse (12270222), we get a palindrome (34477443).

The spelling of 22207221 in words is "twenty-two million, two hundred seven thousand, two hundred twenty-one".