42472521 has 24 divisors (see below), whose sum is σ = 75508160. Its totient is φ = 22402656.

The previous prime is 42472499. The next prime is 42472523. The reversal of 42472521 is 12527424.

It is not a de Polignac number, because 42472521 - 2⁵ = 42472489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42472523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25111 + ... + 26748.

Almost surely, 2^42472521 is an apocalyptic number.

It is an amenable number.

42472521 is a deficient number, since it is larger than the sum of its proper divisors (33035639).

42472521 is a wasteful number, since it uses less digits than its factorization.

42472521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51885 (or 51882 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 42472521 is about 6517.0945213339. The cubic root of 42472521 is about 348.9013741451.

Adding to 42472521 its reverse (12527424), we get a palindrome (54999945).

The spelling of 42472521 in words is "forty-two million, four hundred seventy-two thousand, five hundred twenty-one".