233143221 has 8 divisors (see below), whose sum is σ = 311577280. Its totient is φ = 155068992.

The previous prime is 233143213. The next prime is 233143223. The reversal of 233143221 is 122341332.

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

It is not a de Polignac number, because 233143221 - 2³ = 233143213 is a prime.

It is a super-2 number, since 2×233143221² = 108711522996509682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233143223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88441 + ... + 91038.

It is an arithmetic number, because the mean of its divisors is an integer number (38947160).

Almost surely, 2^233143221 is an apocalyptic number.

It is an amenable number.

233143221 is a deficient number, since it is larger than the sum of its proper divisors (78434059).

233143221 is a wasteful number, since it uses less digits than its factorization.

233143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179915.

The product of its digits is 864, while the sum is 21.

The square root of 233143221 is about 15269.0281616087. The cubic root of 233143221 is about 615.4710041128.

Adding to 233143221 its reverse (122341332), we get a palindrome (355484553).

The spelling of 233143221 in words is "two hundred thirty-three million, one hundred forty-three thousand, two hundred twenty-one".