33130321 has 6 divisors (see below), whose sum is σ = 38539410. Its totient is φ = 28397376.

The previous prime is 33130313. The next prime is 33130333. The reversal of 33130321 is 12303133.

It can be written as a sum of positive squares in only one way, i.e., 27196225 + 5934096 = 5215^2 + 2436^2 .

It is not a de Polignac number, because 33130321 - 2³ = 33130313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33130295 and 33130304.

It is not an unprimeable number, because it can be changed into a prime (33130921) 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, 338016 + ... + 338113.

It is an arithmetic number, because the mean of its divisors is an integer number (6423235).

Almost surely, 2^33130321 is an apocalyptic number.

It is an amenable number.

33130321 is a deficient number, since it is larger than the sum of its proper divisors (5409089).

33130321 is an equidigital number, since it uses as much as digits as its factorization.

33130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676143 (or 676136 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 33130321 is about 5755.8944569893. The cubic root of 33130321 is about 321.1751097969.

Adding to 33130321 its reverse (12303133), we get a palindrome (45433454).

The spelling of 33130321 in words is "thirty-three million, one hundred thirty thousand, three hundred twenty-one".