443413440320021 has 4 divisors (see below), whose sum is σ = 443454266538444. Its totient is φ = 443372614101600.

The previous prime is 443413440319987. The next prime is 443413440320023. The reversal of 443413440320021 is 120023044314344.

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 172384059099121 + 271029381220900 = 13129511^2 + 16462970^2 .

It is a cyclic number.

It is not a de Polignac number, because 443413440320021 - 2⁶ = 443413440319957 is a prime.

It is a super-3 number, since 3×443413440320021³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443413440320023) 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, 20413092920 + ... + 20413114641.

It is an arithmetic number, because the mean of its divisors is an integer number (110863566634611).

Almost surely, 2^{443413440320021} is an apocalyptic number.

It is an amenable number.

443413440320021 is a deficient number, since it is larger than the sum of its proper divisors (40826218423).

443413440320021 is a wasteful number, since it uses less digits than its factorization.

443413440320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40826218422.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 443413440320021 its reverse (120023044314344), we get a palindrome (563436484634365).

The spelling of 443413440320021 in words is "four hundred forty-three trillion, four hundred thirteen billion, four hundred forty million, three hundred twenty thousand, twenty-one".