42521204 has 24 divisors (see below), whose sum is σ = 84708288. Its totient is φ = 18487040.

The previous prime is 42521203. The next prime is 42521231. The reversal of 42521204 is 40212524.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521203) 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, 19997 + ... + 22020.

It is an arithmetic number, because the mean of its divisors is an integer number (3529512).

Almost surely, 2^42521204 is an apocalyptic number.

42521204 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

42521204 is a deficient number, since it is larger than the sum of its proper divisors (42187084).

42521204 is a wasteful number, since it uses less digits than its factorization.

42521204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42055 (or 42053 counting only the distinct ones).

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

The square root of 42521204 is about 6520.8284749716. The cubic root of 42521204 is about 349.0346295580.

Adding to 42521204 its reverse (40212524), we get a palindrome (82733728).

The spelling of 42521204 in words is "forty-two million, five hundred twenty-one thousand, two hundred four".