444404200121221 has 4 divisors (see below), whose sum is σ = 444454172490412. Its totient is φ = 444354227752032.

The previous prime is 444404200121213. The next prime is 444404200121341. The reversal of 444404200121221 is 122121002404444.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69985957109121 + 374418243012100 = 8365761^2 + 19349890^2 .

It is a cyclic number.

It is not a de Polignac number, because 444404200121221 - 2³ = 444404200121213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444404200121521) 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, 24986171256 + ... + 24986189041.

It is an arithmetic number, because the mean of its divisors is an integer number (111113543122603).

Almost surely, 2^{444404200121221} is an apocalyptic number.

It is an amenable number.

444404200121221 is a deficient number, since it is larger than the sum of its proper divisors (49972369191).

444404200121221 is an equidigital number, since it uses as much as digits as its factorization.

444404200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49972369190.

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 444404200121221 its reverse (122121002404444), we get a palindrome (566525202525665).

The spelling of 444404200121221 in words is "four hundred forty-four trillion, four hundred four billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".