20441323421 has 4 divisors (see below), whose sum is σ = 20652058812. Its totient is φ = 20230588032.

The previous prime is 20441323403. The next prime is 20441323423. The reversal of 20441323421 is 12432314402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12432314402 = 2 ⋅6216157201.

It can be written as a sum of positive squares in 2 ways, for example, as 12922005625 + 7519317796 = 113675^2 + 86714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20441323421 - 2¹⁰ = 20441322397 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 (20441323423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105367550 + ... + 105367743.

It is an arithmetic number, because the mean of its divisors is an integer number (5163014703).

Almost surely, 2^20441323421 is an apocalyptic number.

It is an amenable number.

20441323421 is a deficient number, since it is larger than the sum of its proper divisors (210735391).

20441323421 is an equidigital number, since it uses as much as digits as its factorization.

20441323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210735390.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20441323421 its reverse (12432314402), we get a palindrome (32873637823).

The spelling of 20441323421 in words is "twenty billion, four hundred forty-one million, three hundred twenty-three thousand, four hundred twenty-one".