233220321 has 6 divisors (see below), whose sum is σ = 336873810. Its totient is φ = 155480208.

The previous prime is 233220319. The next prime is 233220371. The reversal of 233220321 is 123022332.

It is a happy number.

233220321 is a `hidden beast` number, since 23 + 322 + 0 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 111007296 = 11055^2 + 10536^2 .

It is not a de Polignac number, because 233220321 - 2¹ = 233220319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 233220294 and 233220303.

It is not an unprimeable number, because it can be changed into a prime (233220371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12956676 + ... + 12956693.

It is an arithmetic number, because the mean of its divisors is an integer number (56145635).

Almost surely, 2^233220321 is an apocalyptic number.

It is an amenable number.

233220321 is a deficient number, since it is larger than the sum of its proper divisors (103653489).

233220321 is a wasteful number, since it uses less digits than its factorization.

233220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25913375 (or 25913372 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 233220321 is about 15271.5526715524. The cubic root of 233220321 is about 615.5388416482.

Adding to 233220321 its reverse (123022332), we get a palindrome (356242653).

The spelling of 233220321 in words is "two hundred thirty-three million, two hundred twenty thousand, three hundred twenty-one".