42521432 has 8 divisors (see below), whose sum is σ = 79727700. Its totient is φ = 21260712.

The previous prime is 42521419. The next prime is 42521443. The reversal of 42521432 is 23412524.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 42521398 and 42521407.

It is a congruent number.

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, 2657582 + ... + 2657597.

Almost surely, 2^42521432 is an apocalyptic number.

It is an amenable number.

42521432 is a deficient number, since it is larger than the sum of its proper divisors (37206268).

42521432 is a wasteful number, since it uses less digits than its factorization.

42521432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315185 (or 5315181 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 42521432 is about 6520.8459573893. The cubic root of 42521432 is about 349.0352534017.

Adding to 42521432 its reverse (23412524), we get a palindrome (65933956).

The spelling of 42521432 in words is "forty-two million, five hundred twenty-one thousand, four hundred thirty-two".