20041321 has 4 divisors (see below), whose sum is σ = 20052100. Its totient is φ = 20030544.

The previous prime is 20041279. The next prime is 20041327. The reversal of 20041321 is 12314002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12314002 = 2 ⋅6157001.

It can be written as a sum of positive squares in 2 ways, for example, as 11256025 + 8785296 = 3355^2 + 2964^2 .

It is a cyclic number.

It is not a de Polignac number, because 20041321 - 2¹¹ = 20039273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20041327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (5013025).

Almost surely, 2^20041321 is an apocalyptic number.

It is an amenable number.

20041321 is a deficient number, since it is larger than the sum of its proper divisors (10779).

20041321 is an equidigital number, since it uses as much as digits as its factorization.

20041321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10778.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20041321 is about 4476.7533995073. The cubic root of 20041321 is about 271.6285704836.

Adding to 20041321 its reverse (12314002), we get a palindrome (32355323).

The spelling of 20041321 in words is "twenty million, forty-one thousand, three hundred twenty-one".