22232221 has 8 divisors (see below), whose sum is σ = 24494688. Its totient is φ = 20010000.

The previous prime is 22232219. The next prime is 22232233. The reversal of 22232221 is 12223222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22232221 - 2¹ = 22232219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22232195 and 22232204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22232201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8895 + ... + 11116.

It is an arithmetic number, because the mean of its divisors is an integer number (3061836).

Almost surely, 2^22232221 is an apocalyptic number.

It is an amenable number.

22232221 is a deficient number, since it is larger than the sum of its proper divisors (2262467).

22232221 is a wasteful number, since it uses less digits than its factorization.

22232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20123.

The product of its digits is 192, while the sum is 16.

The square root of 22232221 is about 4715.1056191776. The cubic root of 22232221 is about 281.1863819236.

Adding to 22232221 its reverse (12223222), we get a palindrome (34455443).

It can be divided in two parts, 2223 and 2221, that added together give a palindrome (4444).

The spelling of 22232221 in words is "twenty-two million, two hundred thirty-two thousand, two hundred twenty-one".