20031230321 has 4 divisors (see below), whose sum is σ = 20188956672. Its totient is φ = 19873503972.

The previous prime is 20031230299. The next prime is 20031230353. The reversal of 20031230321 is 12303213002.

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 20031230321 - 2²² = 20027036017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20031230321.

It is not an unprimeable number, because it can be changed into a prime (20031230621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78862985 + ... + 78863238.

It is an arithmetic number, because the mean of its divisors is an integer number (5047239168).

Almost surely, 2^20031230321 is an apocalyptic number.

It is an amenable number.

20031230321 is a deficient number, since it is larger than the sum of its proper divisors (157726351).

20031230321 is a wasteful number, since it uses less digits than its factorization.

20031230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157726350.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20031230321 its reverse (12303213002), we get a palindrome (32334443323).

The spelling of 20031230321 in words is "twenty billion, thirty-one million, two hundred thirty thousand, three hundred twenty-one".