42421189 has 4 divisors (see below), whose sum is σ = 42434560. Its totient is φ = 42407820.

The previous prime is 42421187. The next prime is 42421193. The reversal of 42421189 is 98112424.

42421189 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42421189 - 2¹ = 42421187 is a prime.

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 42421189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42421187) 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, 1084 + ... + 9274.

It is an arithmetic number, because the mean of its divisors is an integer number (10608640).

Almost surely, 2^42421189 is an apocalyptic number.

It is an amenable number.

42421189 is a deficient number, since it is larger than the sum of its proper divisors (13371).

42421189 is an equidigital number, since it uses as much as digits as its factorization.

42421189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13370.

The product of its digits is 4608, while the sum is 31.

The square root of 42421189 is about 6513.1550726203. The cubic root of 42421189 is about 348.7607575378.

The spelling of 42421189 in words is "forty-two million, four hundred twenty-one thousand, one hundred eighty-nine".