42521042 has 4 divisors (see below), whose sum is σ = 63781566. Its totient is φ = 21260520.

The previous prime is 42521027. The next prime is 42521077. The reversal of 42521042 is 24012524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34798201 + 7722841 = 5899^2 + 2779^2 .

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 as a sum of consecutive naturals, namely, 10630259 + ... + 10630262.

Almost surely, 2^42521042 is an apocalyptic number.

42521042 is a deficient number, since it is larger than the sum of its proper divisors (21260524).

42521042 is a wasteful number, since it uses less digits than its factorization.

42521042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21260523.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42521042 is about 6520.8160532252. The cubic root of 42521042 is about 349.0341862993.

Adding to 42521042 its reverse (24012524), we get a palindrome (66533566).

The spelling of 42521042 in words is "forty-two million, five hundred twenty-one thousand, forty-two".