42584221 has 4 divisors (see below), whose sum is σ = 42703200. Its totient is φ = 42465244.

The previous prime is 42584203. The next prime is 42584237. The reversal of 42584221 is 12248524.

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 42584221 - 2⁵ = 42584189 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 42584221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42584821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58951 + ... + 59668.

It is an arithmetic number, because the mean of its divisors is an integer number (10675800).

Almost surely, 2^42584221 is an apocalyptic number.

It is an amenable number.

42584221 is a deficient number, since it is larger than the sum of its proper divisors (118979).

42584221 is a wasteful number, since it uses less digits than its factorization.

42584221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118978.

The product of its digits is 5120, while the sum is 28.

The square root of 42584221 is about 6525.6586640737. The cubic root of 42584221 is about 349.2069691316.

The spelling of 42584221 in words is "forty-two million, five hundred eighty-four thousand, two hundred twenty-one".