444400433233221 has 32 divisors (see below), whose sum is σ = 634532793126400. Its totient is φ = 275828059805760.

The previous prime is 444400433233213. The next prime is 444400433233241. The reversal of 444400433233221 is 122332334004444.

It is a happy number.

It is not a de Polignac number, because 444400433233221 - 2³ = 444400433233213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 444400433233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444400433233241) 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, 136593691 + ... + 139809288.

It is an arithmetic number, because the mean of its divisors is an integer number (19829149785200).

Almost surely, 2^{444400433233221} is an apocalyptic number.

It is an amenable number.

444400433233221 is a deficient number, since it is larger than the sum of its proper divisors (190132359893179).

444400433233221 is a wasteful number, since it uses less digits than its factorization.

444400433233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276403489.

The product of its (nonzero) digits is 663552, while the sum is 39.

Adding to 444400433233221 its reverse (122332334004444), we get a palindrome (566732767237665).

The spelling of 444400433233221 in words is "four hundred forty-four trillion, four hundred billion, four hundred thirty-three million, two hundred thirty-three thousand, two hundred twenty-one".