42521425 has 12 divisors (see below), whose sum is σ = 53023516. Its totient is φ = 33825600.

The previous prime is 42521419. The next prime is 42521443. The reversal of 42521425 is 52412524.

It can be written as a sum of positive squares in 6 ways, for example, as 23503104 + 19018321 = 4848^2 + 4361^2 .

It is not a de Polignac number, because 42521425 - 2¹⁵ = 42488657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42521425.

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 in 11 ways as a sum of consecutive naturals, for example, 174 + ... + 9223.

Almost surely, 2^42521425 is an apocalyptic number.

It is an amenable number.

42521425 is a deficient number, since it is larger than the sum of its proper divisors (10502091).

42521425 is a wasteful number, since it uses less digits than its factorization.

42521425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9588 (or 9583 counting only the distinct ones).

The product of its digits is 3200, while the sum is 25.

The square root of 42521425 is about 6520.8454206491. The cubic root of 42521425 is about 349.0352342486.

Adding to 42521425 its reverse (52412524), we get a palindrome (94933949).

The spelling of 42521425 in words is "forty-two million, five hundred twenty-one thousand, four hundred twenty-five".