42521305 has 16 divisors (see below), whose sum is σ = 53964288. Its totient is φ = 32112000.

The previous prime is 42521299. The next prime is 42521329. The reversal of 42521305 is 50312524.

It is not a de Polignac number, because 42521305 - 2¹³ = 42513113 is a prime.

It is a super-2 number, since 2×42521305² = 3616122757806050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3010 + ... + 9700.

It is an arithmetic number, because the mean of its divisors is an integer number (3372768).

Almost surely, 2^42521305 is an apocalyptic number.

It is an amenable number.

42521305 is a deficient number, since it is larger than the sum of its proper divisors (11442983).

42521305 is a wasteful number, since it uses less digits than its factorization.

42521305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6768.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 42521305 is about 6520.8362193817. The cubic root of 42521305 is about 349.0349059101.

Adding to 42521305 its reverse (50312524), we get a palindrome (92833829).

The spelling of 42521305 in words is "forty-two million, five hundred twenty-one thousand, three hundred five".