233211221 has 4 divisors (see below), whose sum is σ = 233596032. Its totient is φ = 232826412.

The previous prime is 233211217. The next prime is 233211229. The reversal of 233211221 is 122112332.

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 233211221 - 2² = 233211217 is a prime.

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 233211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233211229) 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, 191495 + ... + 192708.

It is an arithmetic number, because the mean of its divisors is an integer number (58399008).

Almost surely, 2^233211221 is an apocalyptic number.

It is an amenable number.

233211221 is a deficient number, since it is larger than the sum of its proper divisors (384811).

233211221 is an equidigital number, since it uses as much as digits as its factorization.

233211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384810.

The product of its digits is 144, while the sum is 17.

The square root of 233211221 is about 15271.2547290653. The cubic root of 233211221 is about 615.5308356616.

Adding to 233211221 its reverse (122112332), we get a palindrome (355323553).

It can be divided in two parts, 23321 and 1221, that added together give a palindrome (24542).

The spelling of 233211221 in words is "two hundred thirty-three million, two hundred eleven thousand, two hundred twenty-one".