443121100001321 has 6 divisors (see below), whose sum is σ = 515467402042410. Its totient is φ = 379818085715376.

The previous prime is 443121100001273. The next prime is 443121100001323. The reversal of 443121100001321 is 123100001121344.

It can be written as a sum of positive squares in only one way, i.e., 396599697165721 + 46521402835600 = 19914811^2 + 6820660^2 .

It is not a de Polignac number, because 443121100001321 - 2²² = 443121095807017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (443121100001323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4521643877516 + ... + 4521643877613.

It is an arithmetic number, because the mean of its divisors is an integer number (85911233673735).

Almost surely, 2^{443121100001321} is an apocalyptic number.

It is an amenable number.

443121100001321 is a deficient number, since it is larger than the sum of its proper divisors (72346302041089).

443121100001321 is an equidigital number, since it uses as much as digits as its factorization.

443121100001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043287755143 (or 9043287755136 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 443121100001321 its reverse (123100001121344), we get a palindrome (566221101122665).

The spelling of 443121100001321 in words is "four hundred forty-three trillion, one hundred twenty-one billion, one hundred million, one thousand, three hundred twenty-one".