42521442 has 8 divisors (see below), whose sum is σ = 85042896. Its totient is φ = 14173812.

The previous prime is 42521419. The next prime is 42521443. The reversal of 42521442 is 24412524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

42521442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (42521443) 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 3 ways as a sum of consecutive naturals, for example, 3543448 + ... + 3543459.

It is an arithmetic number, because the mean of its divisors is an integer number (10630362).

Almost surely, 2^42521442 is an apocalyptic number.

42521442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42521442 is a wasteful number, since it uses less digits than its factorization.

42521442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086912.

The product of its digits is 2560, while the sum is 24.

The square root of 42521442 is about 6520.8467241609. The cubic root of 42521442 is about 349.0352807632.

Adding to 42521442 its reverse (24412524), we get a palindrome (66933966).

The spelling of 42521442 in words is "forty-two million, five hundred twenty-one thousand, four hundred forty-two".