442432621521 has 48 divisors (see below), whose sum is σ = 707745392640. Its totient is φ = 264074168160.

The previous prime is 442432621507. The next prime is 442432621523. The reversal of 442432621521 is 125126234244.

442432621521 is a `hidden beast` number, since 4 + 4 + 2 + 4 + 3 + 2 + 621 + 5 + 21 = 666.

It is not a de Polignac number, because 442432621521 - 2⁵ = 442432621489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442432621523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52522516 + ... + 52530938.

It is an arithmetic number, because the mean of its divisors is an integer number (14744695680).

Almost surely, 2^442432621521 is an apocalyptic number.

It is an amenable number.

442432621521 is a deficient number, since it is larger than the sum of its proper divisors (265312771119).

442432621521 is a wasteful number, since it uses less digits than its factorization.

442432621521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16426 (or 16423 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 442432621521 its reverse (125126234244), we get a palindrome (567558855765).

The spelling of 442432621521 in words is "four hundred forty-two billion, four hundred thirty-two million, six hundred twenty-one thousand, five hundred twenty-one".