42304521 has 16 divisors (see below), whose sum is σ = 67267584. Its totient is φ = 23122704.

The previous prime is 42304499. The next prime is 42304523. The reversal of 42304521 is 12540324.

It is not a de Polignac number, because 42304521 - 2¹¹ = 42302473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42304523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43311 + ... + 44276.

It is an arithmetic number, because the mean of its divisors is an integer number (4204224).

Almost surely, 2^42304521 is an apocalyptic number.

It is an amenable number.

42304521 is a deficient number, since it is larger than the sum of its proper divisors (24963063).

42304521 is a wasteful number, since it uses less digits than its factorization.

42304521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87620.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42304521 is about 6504.1925709499. The cubic root of 42304521 is about 348.4407399579.

Adding to 42304521 its reverse (12540324), we get a palindrome (54844845).

The spelling of 42304521 in words is "forty-two million, three hundred four thousand, five hundred twenty-one".