21303230321 has 8 divisors (see below), whose sum is σ = 22053097920. Its totient is φ = 20554381008.

The previous prime is 21303230243. The next prime is 21303230353. The reversal of 21303230321 is 12303230312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303230321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21303230293 and 21303230302.

It is not an unprimeable number, because it can be changed into a prime (21303220321) 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, 211871 + ... + 295796.

It is an arithmetic number, because the mean of its divisors is an integer number (2756637240).

Almost surely, 2^21303230321 is an apocalyptic number.

It is an amenable number.

21303230321 is a deficient number, since it is larger than the sum of its proper divisors (749867599).

21303230321 is a wasteful number, since it uses less digits than its factorization.

21303230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509143.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21303230321 its reverse (12303230312), we get a palindrome (33606460633).

Subtracting from 21303230321 its reverse (12303230312), we obtain a palindrome (9000000009).

The spelling of 21303230321 in words is "twenty-one billion, three hundred three million, two hundred thirty thousand, three hundred twenty-one".