42624821 has 4 divisors (see below), whose sum is σ = 42643392. Its totient is φ = 42606252.

The previous prime is 42624811. The next prime is 42624823. The reversal of 42624821 is 12842624.

42624821 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 42624821 - 2¹⁰ = 42623797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42624823) 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, 5261 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (10660848).

Almost surely, 2^42624821 is an apocalyptic number.

It is an amenable number.

42624821 is a deficient number, since it is larger than the sum of its proper divisors (18571).

42624821 is a wasteful number, since it uses less digits than its factorization.

42624821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18570.

The product of its digits is 6144, while the sum is 29.

The square root of 42624821 is about 6528.7687200574. The cubic root of 42624821 is about 349.3179124128.

The spelling of 42624821 in words is "forty-two million, six hundred twenty-four thousand, eight hundred twenty-one".