442521111 has 8 divisors (see below), whose sum is σ = 590512384. Its totient is φ = 294771960.

The previous prime is 442521091. The next prime is 442521113. The reversal of 442521111 is 111125244.

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

It is not a de Polignac number, because 442521111 - 2²¹ = 440423959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442521113) 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, 56221 + ... + 63606.

It is an arithmetic number, because the mean of its divisors is an integer number (73814048).

Almost surely, 2^442521111 is an apocalyptic number.

442521111 is a deficient number, since it is larger than the sum of its proper divisors (147991273).

442521111 is a wasteful number, since it uses less digits than its factorization.

442521111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121061.

The product of its digits is 320, while the sum is 21.

The square root of 442521111 is about 21036.1857521748. The cubic root of 442521111 is about 762.0404029941.

Adding to 442521111 its reverse (111125244), we get a palindrome (553646355).

The spelling of 442521111 in words is "four hundred forty-two million, five hundred twenty-one thousand, one hundred eleven".