42521403 has 16 divisors (see below), whose sum is σ = 60880896. Its totient is φ = 26302080.

The previous prime is 42521389. The next prime is 42521419. The reversal of 42521403 is 30412524.

42521403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42521403 - 2⁵ = 42521371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42521403.

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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2251 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (3805056).

Almost surely, 2^42521403 is an apocalyptic number.

42521403 is a deficient number, since it is larger than the sum of its proper divisors (18359493).

42521403 is a wasteful number, since it uses less digits than its factorization.

42521403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11834.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42521403 is about 6520.8437337510. The cubic root of 42521403 is about 349.0351740533.

Adding to 42521403 its reverse (30412524), we get a palindrome (72933927).

It can be divided in two parts, 42521 and 403, that added together give a palindrome (42924).

The spelling of 42521403 in words is "forty-two million, five hundred twenty-one thousand, four hundred three".