233121321 has 24 divisors (see below), whose sum is σ = 354949504. Its totient is φ = 152856720.

The previous prime is 233121319. The next prime is 233121347. The reversal of 233121321 is 123121332.

233121321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 233121321 - 2¹ = 233121319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 233121294 and 233121303.

It is not an unprimeable number, because it can be changed into a prime (233121311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6960 + ... + 22686.

Almost surely, 2^233121321 is an apocalyptic number.

It is an amenable number.

233121321 is a deficient number, since it is larger than the sum of its proper divisors (121828183).

233121321 is an equidigital number, since it uses as much as digits as its factorization.

233121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15803 (or 15791 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 233121321 is about 15268.3110067879. The cubic root of 233121321 is about 615.4517323579.

Adding to 233121321 its reverse (123121332), we get a palindrome (356242653).

The spelling of 233121321 in words is "two hundred thirty-three million, one hundred twenty-one thousand, three hundred twenty-one".