22532221 has 4 divisors (see below), whose sum is σ = 22570812. Its totient is φ = 22493632.

The previous prime is 22532207. The next prime is 22532239. The reversal of 22532221 is 12223522.

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 18576100 + 3956121 = 4310^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 22532221 - 2⁵ = 22532189 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 (22532281) 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, 18406 + ... + 19591.

It is an arithmetic number, because the mean of its divisors is an integer number (5642703).

Almost surely, 2^22532221 is an apocalyptic number.

It is an amenable number.

22532221 is a deficient number, since it is larger than the sum of its proper divisors (38591).

22532221 is an equidigital number, since it uses as much as digits as its factorization.

22532221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38590.

The product of its digits is 480, while the sum is 19.

The square root of 22532221 is about 4746.8116667928. The cubic root of 22532221 is about 282.4455049295.

Adding to 22532221 its reverse (12223522), we get a palindrome (34755743).

The spelling of 22532221 in words is "twenty-two million, five hundred thirty-two thousand, two hundred twenty-one".