442432221 has 24 divisors (see below), whose sum is σ = 748607904. Its totient is φ = 229834080.

The previous prime is 442432183. The next prime is 442432241. The reversal of 442432221 is 122234244.

It is not a de Polignac number, because 442432221 - 2¹¹ = 442430173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442432191 and 442432200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442432241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135190 + ... + 138423.

It is an arithmetic number, because the mean of its divisors is an integer number (31191996).

Almost surely, 2^442432221 is an apocalyptic number.

It is an amenable number.

442432221 is a deficient number, since it is larger than the sum of its proper divisors (306175683).

442432221 is a wasteful number, since it uses less digits than its factorization.

442432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273641 (or 273634 counting only the distinct ones).

The product of its digits is 3072, while the sum is 24.

The square root of 442432221 is about 21034.0728581033. The cubic root of 442432221 is about 761.9893754417.

Adding to 442432221 its reverse (122234244), we get a palindrome (564666465).

It can be divided in two parts, 44243 and 2221, that added together give a palindrome (46464).

The spelling of 442432221 in words is "four hundred forty-two million, four hundred thirty-two thousand, two hundred twenty-one".