20233221 has 4 divisors (see below), whose sum is σ = 26977632. Its totient is φ = 13488812.

The previous prime is 20233207. The next prime is 20233231. The reversal of 20233221 is 12233202.

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.

It is a cyclic number.

It is not a de Polignac number, because 20233221 - 2⁷ = 20233093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3372201 + ... + 3372206.

It is an arithmetic number, because the mean of its divisors is an integer number (6744408).

Almost surely, 2^20233221 is an apocalyptic number.

It is an amenable number.

20233221 is a deficient number, since it is larger than the sum of its proper divisors (6744411).

20233221 is an equidigital number, since it uses as much as digits as its factorization.

20233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744410.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20233221 is about 4498.1352803134. The cubic root of 20233221 is about 272.4927854892.

Adding to 20233221 its reverse (12233202), we get a palindrome (32466423).

The spelling of 20233221 in words is "twenty million, two hundred thirty-three thousand, two hundred twenty-one".