444142221 has 16 divisors (see below), whose sum is σ = 648648000. Its totient is φ = 269067008.

The previous prime is 444142219. The next prime is 444142247. The reversal of 444142221 is 122241444.

It is a cyclic number.

It is not a de Polignac number, because 444142221 - 2¹ = 444142219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 444142191 and 444142200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444142201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148671 + ... + 151628.

It is an arithmetic number, because the mean of its divisors is an integer number (40540500).

Almost surely, 2^444142221 is an apocalyptic number.

It is an amenable number.

444142221 is a deficient number, since it is larger than the sum of its proper divisors (204505779).

444142221 is a wasteful number, since it uses less digits than its factorization.

444142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300348.

The product of its digits is 2048, while the sum is 24.

The square root of 444142221 is about 21074.6819904833. The cubic root of 444142221 is about 762.9698094045.

Adding to 444142221 its reverse (122241444), we get a palindrome (566383665).

The spelling of 444142221 in words is "four hundred forty-four million, one hundred forty-two thousand, two hundred twenty-one".