42004122421 has 8 divisors (see below), whose sum is σ = 43375497984. Its totient is φ = 40633772160.

The previous prime is 42004122379. The next prime is 42004122437. The reversal of 42004122421 is 12422140024.

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 42004122421 - 2¹⁵ = 42004089653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42004122392 and 42004122401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004122521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172615 + ... + 337348.

It is an arithmetic number, because the mean of its divisors is an integer number (5421937248).

Almost surely, 2^42004122421 is an apocalyptic number.

It is an amenable number.

42004122421 is a deficient number, since it is larger than the sum of its proper divisors (1371375563).

42004122421 is a wasteful number, since it uses less digits than its factorization.

42004122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512651.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 42004122421 its reverse (12422140024), we get a palindrome (54426262445).

The spelling of 42004122421 in words is "forty-two billion, four million, one hundred twenty-two thousand, four hundred twenty-one".