442531221 has 16 divisors (see below), whose sum is σ = 644036160. Its totient is φ = 268053120.

The previous prime is 442531207. The next prime is 442531237. The reversal of 442531221 is 122135244.

It is not a de Polignac number, because 442531221 - 2¹¹ = 442529173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442531191 and 442531200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442531121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104481 + ... + 108633.

It is an arithmetic number, because the mean of its divisors is an integer number (40252260).

Almost surely, 2^442531221 is an apocalyptic number.

It is an amenable number.

442531221 is a deficient number, since it is larger than the sum of its proper divisors (201504939).

442531221 is a wasteful number, since it uses less digits than its factorization.

442531221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396.

The product of its digits is 1920, while the sum is 24.

The square root of 442531221 is about 21036.4260510192. The cubic root of 442531221 is about 762.0462062349.

Adding to 442531221 its reverse (122135244), we get a palindrome (564666465).

The spelling of 442531221 in words is "four hundred forty-two million, five hundred thirty-one thousand, two hundred twenty-one".