20304240221 has 32 divisors (see below), whose sum is σ = 21698457600. Its totient is φ = 18972195840.

The previous prime is 20304240167. The next prime is 20304240289. The reversal of 20304240221 is 12204240302.

It is a cyclic number.

It is not a de Polignac number, because 20304240221 - 2⁶ = 20304240157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20304240193 and 20304240202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304240421) 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 31 ways as a sum of consecutive naturals, for example, 24492035 + ... + 24492863.

It is an arithmetic number, because the mean of its divisors is an integer number (678076800).

Almost surely, 2^20304240221 is an apocalyptic number.

It is an amenable number.

20304240221 is a deficient number, since it is larger than the sum of its proper divisors (1394217379).

20304240221 is a wasteful number, since it uses less digits than its factorization.

20304240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20304240221 its reverse (12204240302), we get a palindrome (32508480523).

The spelling of 20304240221 in words is "twenty billion, three hundred four million, two hundred forty thousand, two hundred twenty-one".