42513521 has 8 divisors (see below), whose sum is σ = 44016384. Its totient is φ = 41035680.

The previous prime is 42513517. The next prime is 42513529. The reversal of 42513521 is 12531524.

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

It is a cyclic number.

It is not a de Polignac number, because 42513521 - 2² = 42513517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42513529) 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 in 7 ways as a sum of consecutive naturals, for example, 2765 + ... + 9626.

It is an arithmetic number, because the mean of its divisors is an integer number (5502048).

Almost surely, 2^42513521 is an apocalyptic number.

It is an amenable number.

42513521 is a deficient number, since it is larger than the sum of its proper divisors (1502863).

42513521 is a wasteful number, since it uses less digits than its factorization.

42513521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12511.

The product of its digits is 1200, while the sum is 23.

The square root of 42513521 is about 6520.2393360980. The cubic root of 42513521 is about 349.0136063638.

It can be divided in two parts, 42513 and 521, that added together give a palindrome (43034).

The spelling of 42513521 in words is "forty-two million, five hundred thirteen thousand, five hundred twenty-one".