42530321 has 2 divisors, whose sum is σ = 42530322. Its totient is φ = 42530320.

The previous prime is 42530309. The next prime is 42530351. The reversal of 42530321 is 12303524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 215296 = 6505^2 + 464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42530321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42530293 and 42530302.

It is not a weakly prime, because it can be changed into another prime (42530351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265160 + 21265161.

It is an arithmetic number, because the mean of its divisors is an integer number (21265161).

Almost surely, 2^42530321 is an apocalyptic number.

It is an amenable number.

42530321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42530321 is an equidigital number, since it uses as much as digits as its factorization.

42530321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 42530321 is about 6521.5275051172. The cubic root of 42530321 is about 349.0595733587.

Adding to 42530321 its reverse (12303524), we get a palindrome (54833845).

The spelling of 42530321 in words is "forty-two million, five hundred thirty thousand, three hundred twenty-one".