445216221 has 24 divisors (see below), whose sum is σ = 680524416. Its totient is φ = 279898080.

The previous prime is 445216147. The next prime is 445216223. The reversal of 445216221 is 122612544.

445216221 is a `hidden beast` number, since 445 + 216 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 445216221 - 2¹⁴ = 445199837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445216223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450 + ... + 29843.

It is an arithmetic number, because the mean of its divisors is an integer number (28355184).

Almost surely, 2^445216221 is an apocalyptic number.

It is an amenable number.

445216221 is a deficient number, since it is larger than the sum of its proper divisors (235308195).

445216221 is a wasteful number, since it uses less digits than its factorization.

445216221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30393 (or 30390 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 445216221 is about 21100.1474165466. The cubic root of 445216221 is about 763.5843047342.

Adding to 445216221 its reverse (122612544), we get a palindrome (567828765).

The spelling of 445216221 in words is "four hundred forty-five million, two hundred sixteen thousand, two hundred twenty-one".