42004221 has 24 divisors (see below), whose sum is σ = 65992320. Its totient is φ = 23692032.

The previous prime is 42004219. The next prime is 42004301. The reversal of 42004221 is 12240024.

It is not a de Polignac number, because 42004221 - 2¹ = 42004219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42004221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9805 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (2749680).

Almost surely, 2^42004221 is an apocalyptic number.

It is an amenable number.

42004221 is a deficient number, since it is larger than the sum of its proper divisors (23988099).

42004221 is a wasteful number, since it uses less digits than its factorization.

42004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713 (or 3706 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42004221 is about 6481.0663474462. The cubic root of 42004221 is about 347.6143087878.

Adding to 42004221 its reverse (12240024), we get a palindrome (54244245).

The spelling of 42004221 in words is "forty-two million, four thousand, two hundred twenty-one".