20304431123221 has 8 divisors (see below), whose sum is σ = 23236721805824. Its totient is φ = 17380054856880.

The previous prime is 20304431123203. The next prime is 20304431123233. The reversal of 20304431123221 is 12232113440302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20304431123221 - 2⁵ = 20304431123189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20304431123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304431123281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978598565 + ... + 1978608826.

It is an arithmetic number, because the mean of its divisors is an integer number (2904590225728).

Almost surely, 2^{20304431123221} is an apocalyptic number.

It is an amenable number.

20304431123221 is a deficient number, since it is larger than the sum of its proper divisors (2932290682603).

20304431123221 is an equidigital number, since it uses as much as digits as its factorization.

20304431123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957208131.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 20304431123221 its reverse (12232113440302), we get a palindrome (32536544563523).

The spelling of 20304431123221 in words is "twenty trillion, three hundred four billion, four hundred thirty-one million, one hundred twenty-three thousand, two hundred twenty-one".