442533221 has 8 divisors (see below), whose sum is σ = 476808024. Its totient is φ = 408291840.

The previous prime is 442533211. The next prime is 442533257. The reversal of 442533221 is 122335244.

It can be written as a sum of positive squares in 4 ways, for example, as 16564900 + 425968321 = 4070^2 + 20639^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 442533221 - 2¹⁰ = 442532197 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 (442533211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23741 + ... + 38061.

It is an arithmetic number, because the mean of its divisors is an integer number (59601003).

Almost surely, 2^442533221 is an apocalyptic number.

It is an amenable number.

442533221 is a deficient number, since it is larger than the sum of its proper divisors (34274803).

442533221 is a wasteful number, since it uses less digits than its factorization.

442533221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16711.

The product of its digits is 5760, while the sum is 26.

The square root of 442533221 is about 21036.4735875574. The cubic root of 442533221 is about 762.0473542444.

Adding to 442533221 its reverse (122335244), we get a palindrome (564868465).

It can be divided in two parts, 44253 and 3221, that added together give a palindrome (47474).

The spelling of 442533221 in words is "four hundred forty-two million, five hundred thirty-three thousand, two hundred twenty-one".