442444220221 has 16 divisors (see below), whose sum is σ = 477851996160. Its totient is φ = 408399376000.

The previous prime is 442444220089. The next prime is 442444220261. The reversal of 442444220221 is 122022444244.

It is a cyclic number.

It is not a de Polignac number, because 442444220221 - 2⁹ = 442444219709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442444220261) 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, 1102596 + ... + 1449346.

It is an arithmetic number, because the mean of its divisors is an integer number (29865749760).

Almost surely, 2^442444220221 is an apocalyptic number.

It is an amenable number.

442444220221 is a deficient number, since it is larger than the sum of its proper divisors (35407775939).

442444220221 is a wasteful number, since it uses less digits than its factorization.

442444220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348716.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 442444220221 its reverse (122022444244), we get a palindrome (564466664465).

The spelling of 442444220221 in words is "four hundred forty-two billion, four hundred forty-four million, two hundred twenty thousand, two hundred twenty-one".