42544321 has 4 divisors (see below), whose sum is σ = 42569044. Its totient is φ = 42519600.

The previous prime is 42544309. The next prime is 42544343. The reversal of 42544321 is 12344524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 25897921 = 4080^2 + 5089^2 .

It is a cyclic number.

It is not a de Polignac number, because 42544321 - 2⁵ = 42544289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42544361) 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, 9570 + ... + 13291.

It is an arithmetic number, because the mean of its divisors is an integer number (10642261).

Almost surely, 2^42544321 is an apocalyptic number.

It is an amenable number.

42544321 is a deficient number, since it is larger than the sum of its proper divisors (24723).

42544321 is a wasteful number, since it uses less digits than its factorization.

42544321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24722.

The product of its digits is 3840, while the sum is 25.

The square root of 42544321 is about 6522.6007849630. The cubic root of 42544321 is about 349.0978699418.

Adding to 42544321 its reverse (12344524), we get a palindrome (54888845).

The spelling of 42544321 in words is "forty-two million, five hundred forty-four thousand, three hundred twenty-one".