443121341421221 has 4 divisors (see below), whose sum is σ = 443121444416172. Its totient is φ = 443121238426272.

The previous prime is 443121341421169. The next prime is 443121341421223. The reversal of 443121341421221 is 122124143121344.

It is a happy number.

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 405403687660321 + 37717653760900 = 20134639^2 + 6141470^2 .

It is a cyclic number.

It is not a de Polignac number, because 443121341421221 - 2³⁴ = 443104161552037 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 (443121341421223) 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, 44749166 + ... + 53746911.

It is an arithmetic number, because the mean of its divisors is an integer number (110780361104043).

Almost surely, 2^{443121341421221} is an apocalyptic number.

It is an amenable number.

443121341421221 is a deficient number, since it is larger than the sum of its proper divisors (102994951).

443121341421221 is an equidigital number, since it uses as much as digits as its factorization.

443121341421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102994950.

The product of its digits is 36864, while the sum is 35.

Adding to 443121341421221 its reverse (122124143121344), we get a palindrome (565245484542565).

The spelling of 443121341421221 in words is "four hundred forty-three trillion, one hundred twenty-one billion, three hundred forty-one million, four hundred twenty-one thousand, two hundred twenty-one".