42510321 has 12 divisors (see below), whose sum is σ = 70175872. Its totient is φ = 24291576.

The previous prime is 42510313. The next prime is 42510323. The reversal of 42510321 is 12301524.

42510321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42510321 - 2³ = 42510313 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 = 42510294 and 42510303.

It is not an unprimeable number, because it can be changed into a prime (42510323) 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 11 ways as a sum of consecutive naturals, for example, 337321 + ... + 337446.

Almost surely, 2^42510321 is an apocalyptic number.

It is an amenable number.

42510321 is a deficient number, since it is larger than the sum of its proper divisors (27665551).

42510321 is a wasteful number, since it uses less digits than its factorization.

42510321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674780 (or 674777 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42510321 is about 6519.9939417150. The cubic root of 42510321 is about 349.0048493728.

Adding to 42510321 its reverse (12301524), we get a palindrome (54811845).

The spelling of 42510321 in words is "forty-two million, five hundred ten thousand, three hundred twenty-one".