42412521 has 4 divisors (see below), whose sum is σ = 56550032. Its totient is φ = 28275012.

The previous prime is 42412519. The next prime is 42412523. The reversal of 42412521 is 12521424.

42412521 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 an interprime number because it is at equal distance from previous prime (42412519) and next prime (42412523).

It is not a de Polignac number, because 42412521 - 2¹ = 42412519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42412523) 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, 7068751 + ... + 7068756.

It is an arithmetic number, because the mean of its divisors is an integer number (14137508).

Almost surely, 2^42412521 is an apocalyptic number.

It is an amenable number.

42412521 is a deficient number, since it is larger than the sum of its proper divisors (14137511).

42412521 is a wasteful number, since it uses less digits than its factorization.

42412521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14137510.

The product of its digits is 640, while the sum is 21.

The square root of 42412521 is about 6512.4896161146. The cubic root of 42412521 is about 348.7370016096.

Adding to 42412521 its reverse (12521424), we get a palindrome (54933945).

The spelling of 42412521 in words is "forty-two million, four hundred twelve thousand, five hundred twenty-one".