22233221 has 4 divisors (see below), whose sum is σ = 22243200. Its totient is φ = 22223244.

The previous prime is 22233217. The next prime is 22233257. The reversal of 22233221 is 12233222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22233221 - 2² = 22233217 is a prime.

It is a super-2 number, since 2×22233221² = 988632232069682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22233121) 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, 50 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (5560800).

Almost surely, 2^22233221 is an apocalyptic number.

It is an amenable number.

22233221 is a deficient number, since it is larger than the sum of its proper divisors (9979).

22233221 is an equidigital number, since it uses as much as digits as its factorization.

22233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978.

The product of its digits is 288, while the sum is 17.

The square root of 22233221 is about 4715.2116601485. The cubic root of 22233221 is about 281.1905977592.

Adding to 22233221 its reverse (12233222), we get a palindrome (34466443).

Subtracting from 22233221 its reverse (12233222), we obtain a palindrome (9999999).

The spelling of 22233221 in words is "twenty-two million, two hundred thirty-three thousand, two hundred twenty-one".