42521615 has 8 divisors (see below), whose sum is σ = 52672128. Its totient is φ = 32919840.

The previous prime is 42521603. The next prime is 42521623. The reversal of 42521615 is 51612524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42521615 - 2¹⁴ = 42505231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 137012 + ... + 137321.

It is an arithmetic number, because the mean of its divisors is an integer number (6584016).

Almost surely, 2^42521615 is an apocalyptic number.

42521615 is a deficient number, since it is larger than the sum of its proper divisors (10150513).

42521615 is a wasteful number, since it uses less digits than its factorization.

42521615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274369.

The product of its digits is 2400, while the sum is 26.

The square root of 42521615 is about 6520.8599892959. The cubic root of 42521615 is about 349.0357541167.

Subtracting 42521615 from its reverse (51612524), we obtain a palindrome (9090909).

The spelling of 42521615 in words is "forty-two million, five hundred twenty-one thousand, six hundred fifteen".