42330521 has 4 divisors (see below), whose sum is σ = 42466944. Its totient is φ = 42194100.

The previous prime is 42330487. The next prime is 42330551. The reversal of 42330521 is 12503324.

It is a happy number.

42330521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42330521 - 2¹⁴ = 42314137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42330493 and 42330502.

It is not an unprimeable number, because it can be changed into a prime (42330551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67745 + ... + 68366.

It is an arithmetic number, because the mean of its divisors is an integer number (10616736).

Almost surely, 2^42330521 is an apocalyptic number.

It is an amenable number.

42330521 is a deficient number, since it is larger than the sum of its proper divisors (136423).

42330521 is a wasteful number, since it uses less digits than its factorization.

42330521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136422.

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

The square root of 42330521 is about 6506.1909747563. The cubic root of 42330521 is about 348.5121082475.

Adding to 42330521 its reverse (12503324), we get a palindrome (54833845).

The spelling of 42330521 in words is "forty-two million, three hundred thirty thousand, five hundred twenty-one".