445232021 has 6 divisors (see below), whose sum is σ = 482115330. Its totient is φ = 410983248.

The previous prime is 445231993. The next prime is 445232027. The reversal of 445232021 is 120232544.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20295025 + 424936996 = 4505^2 + 20614^2 .

It is not a de Polignac number, because 445232021 - 2²² = 441037717 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 (445232027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1317086 + ... + 1317423.

It is an arithmetic number, because the mean of its divisors is an integer number (80352555).

Almost surely, 2^445232021 is an apocalyptic number.

It is an amenable number.

445232021 is a deficient number, since it is larger than the sum of its proper divisors (36883309).

445232021 is a wasteful number, since it uses less digits than its factorization.

445232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634535 (or 2634522 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 445232021 is about 21100.5218181921. The cubic root of 445232021 is about 763.5933374159.

Adding to 445232021 its reverse (120232544), we get a palindrome (565464565).

The spelling of 445232021 in words is "four hundred forty-five million, two hundred thirty-two thousand, twenty-one".