42521344 has 18 divisors (see below), whose sum is σ = 84877100. Its totient is φ = 21260544.

The previous prime is 42521341. The next prime is 42521357. The reversal of 42521344 is 44312524.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (42521341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82794 + ... + 83305.

Almost surely, 2^42521344 is an apocalyptic number.

It is an amenable number.

42521344 is a deficient number, since it is larger than the sum of its proper divisors (42355756).

42521344 is an equidigital number, since it uses as much as digits as its factorization.

42521344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166115 (or 166101 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 42521344 is about 6520.8392097950. The cubic root of 42521344 is about 349.0350126202.

Adding to 42521344 its reverse (44312524), we get a palindrome (86833868).

The spelling of 42521344 in words is "forty-two million, five hundred twenty-one thousand, three hundred forty-four".