42525421 has 4 divisors (see below), whose sum is σ = 42603712. Its totient is φ = 42447132.

The previous prime is 42525419. The next prime is 42525433. The reversal of 42525421 is 12452524.

42525421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42525421 - 2¹ = 42525419 is a prime.

It is a super-2 number, since 2×42525421² = 3616822862454482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42525481) 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 3 ways as a sum of consecutive naturals, for example, 38325 + ... + 39418.

It is an arithmetic number, because the mean of its divisors is an integer number (10650928).

Almost surely, 2^42525421 is an apocalyptic number.

It is an amenable number.

42525421 is a deficient number, since it is larger than the sum of its proper divisors (78291).

42525421 is an equidigital number, since it uses as much as digits as its factorization.

42525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78290.

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

The square root of 42525421 is about 6521.1518154387. The cubic root of 42525421 is about 349.0461675692.

Adding to 42525421 its reverse (12452524), we get a palindrome (54977945).

The spelling of 42525421 in words is "forty-two million, five hundred twenty-five thousand, four hundred twenty-one".