444413221 has 4 divisors (see below), whose sum is σ = 507900832. Its totient is φ = 380925612.

The previous prime is 444413161. The next prime is 444413257. The reversal of 444413221 is 122314444.

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.

It is a cyclic number.

It is not a de Polignac number, because 444413221 - 2¹¹ = 444411173 is a prime.

It is a super-2 number, since 2×444413221² = 395006221999189682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444417221) 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, 31743795 + ... + 31743808.

It is an arithmetic number, because the mean of its divisors is an integer number (126975208).

Almost surely, 2^444413221 is an apocalyptic number.

It is an amenable number.

444413221 is a deficient number, since it is larger than the sum of its proper divisors (63487611).

444413221 is an equidigital number, since it uses as much as digits as its factorization.

444413221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63487610.

The product of its digits is 3072, while the sum is 25.

The square root of 444413221 is about 21081.1105257764. The cubic root of 444413221 is about 763.1249569896.

Adding to 444413221 its reverse (122314444), we get a palindrome (566727665).

The spelling of 444413221 in words is "four hundred forty-four million, four hundred thirteen thousand, two hundred twenty-one".