444221021 has 4 divisors (see below), whose sum is σ = 444264000. Its totient is φ = 444178044.

The previous prime is 444221009. The next prime is 444221059. The reversal of 444221021 is 120122444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 444221021 - 2¹⁴ = 444204637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 444220984 and 444221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444221821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4460 + ... + 30138.

It is an arithmetic number, because the mean of its divisors is an integer number (111066000).

Almost surely, 2^444221021 is an apocalyptic number.

It is an amenable number.

444221021 is a deficient number, since it is larger than the sum of its proper divisors (42979).

444221021 is a wasteful number, since it uses less digits than its factorization.

444221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42978.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 444221021 is about 21076.5514494189. The cubic root of 444221021 is about 763.0149289352.

Adding to 444221021 its reverse (120122444), we get a palindrome (564343465).

The spelling of 444221021 in words is "four hundred forty-four million, two hundred twenty-one thousand, twenty-one".