233328421 has 4 divisors (see below), whose sum is σ = 237283200. Its totient is φ = 229373644.

The previous prime is 233328377. The next prime is 233328437. The reversal of 233328421 is 124823332.

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 233328421 - 2¹⁹ = 232804133 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 233328421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233322421) 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, 1977301 + ... + 1977418.

It is an arithmetic number, because the mean of its divisors is an integer number (59320800).

Almost surely, 2^233328421 is an apocalyptic number.

It is an amenable number.

233328421 is a deficient number, since it is larger than the sum of its proper divisors (3954779).

233328421 is an equidigital number, since it uses as much as digits as its factorization.

233328421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954778.

The product of its digits is 6912, while the sum is 28.

The square root of 233328421 is about 15275.0915218207. The cubic root of 233328421 is about 615.6339298042.

The spelling of 233328421 in words is "two hundred thirty-three million, three hundred twenty-eight thousand, four hundred twenty-one".