20323200021 has 4 divisors (see below), whose sum is σ = 27097600032. Its totient is φ = 13548800012.

The previous prime is 20323199999. The next prime is 20323200041. The reversal of 20323200021 is 12000232302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20323200021 - 2³⁰ = 19249458197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323200041) 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, 3387200001 + ... + 3387200006.

It is an arithmetic number, because the mean of its divisors is an integer number (6774400008).

Almost surely, 2^20323200021 is an apocalyptic number.

It is an amenable number.

20323200021 is a deficient number, since it is larger than the sum of its proper divisors (6774400011).

20323200021 is an equidigital number, since it uses as much as digits as its factorization.

20323200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6774400010.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 20323200021 its reverse (12000232302), we get a palindrome (32323432323).

The spelling of 20323200021 in words is "twenty billion, three hundred twenty-three million, two hundred thousand, twenty-one".