445424021 has 32 divisors (see below), whose sum is σ = 560701440. Its totient is φ = 345010176.

The previous prime is 445424017. The next prime is 445424051. The reversal of 445424021 is 120424544.

It is not a de Polignac number, because 445424021 - 2² = 445424017 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 (445424051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1162796 + ... + 1163178.

It is an arithmetic number, because the mean of its divisors is an integer number (17521920).

Almost surely, 2^445424021 is an apocalyptic number.

It is an amenable number.

445424021 is a deficient number, since it is larger than the sum of its proper divisors (115277419).

445424021 is a wasteful number, since it uses less digits than its factorization.

445424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 445424021 is about 21105.0709783218. The cubic root of 445424021 is about 763.7030845773.

Adding to 445424021 its reverse (120424544), we get a palindrome (565848565).

The spelling of 445424021 in words is "four hundred forty-five million, four hundred twenty-four thousand, twenty-one".