42004421 has 8 divisors (see below), whose sum is σ = 45244320. Its totient is φ = 38867472.

The previous prime is 42004409. The next prime is 42004423. The reversal of 42004421 is 12440024.

42004421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42004421 - 2⁶ = 42004357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42004421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004423) 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 7 ways as a sum of consecutive naturals, for example, 24890 + ... + 26523.

It is an arithmetic number, because the mean of its divisors is an integer number (5655540).

Almost surely, 2^42004421 is an apocalyptic number.

It is an amenable number.

42004421 is a deficient number, since it is larger than the sum of its proper divisors (3239899).

42004421 is a wasteful number, since it uses less digits than its factorization.

42004421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51475.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42004421 is about 6481.0817769875. The cubic root of 42004421 is about 347.6148605003.

Adding to 42004421 its reverse (12440024), we get a palindrome (54444445).

The spelling of 42004421 in words is "forty-two million, four thousand, four hundred twenty-one".