444561021 has 32 divisors (see below), whose sum is σ = 670830720. Its totient is φ = 290915712.

The previous prime is 444561001. The next prime is 444561077. The reversal of 444561021 is 120165444.

444561021 is a `hidden beast` number, since 4 + 4 + 45 + 610 + 2 + 1 = 666.

It is not a de Polignac number, because 444561021 - 2⁹ = 444560509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444561001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 557395 + ... + 558191.

It is an arithmetic number, because the mean of its divisors is an integer number (20963460).

Almost surely, 2^444561021 is an apocalyptic number.

It is an amenable number.

444561021 is a deficient number, since it is larger than the sum of its proper divisors (226269699).

444561021 is a wasteful number, since it uses less digits than its factorization.

444561021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1156 counting only the distinct ones).

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

The square root of 444561021 is about 21084.6157422894. The cubic root of 444561021 is about 763.2095459577.

The spelling of 444561021 in words is "four hundred forty-four million, five hundred sixty-one thousand, twenty-one".