21303130321 has 32 divisors (see below), whose sum is σ = 24828768000. Its totient is φ = 18063482880.

The previous prime is 21303130309. The next prime is 21303130339. The reversal of 21303130321 is 12303130312.

It is a cyclic number.

It is not a de Polignac number, because 21303130321 - 2⁷ = 21303130193 is a prime.

It is a super-2 number, since 2×21303130321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303130351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22930785 + ... + 22931713.

It is an arithmetic number, because the mean of its divisors is an integer number (775899000).

Almost surely, 2^21303130321 is an apocalyptic number.

It is an amenable number.

21303130321 is a deficient number, since it is larger than the sum of its proper divisors (3525637679).

21303130321 is a wasteful number, since it uses less digits than its factorization.

21303130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21303130321 its reverse (12303130312), we get a palindrome (33606260633).

Subtracting from 21303130321 its reverse (12303130312), we obtain a palindrome (9000000009).

The spelling of 21303130321 in words is "twenty-one billion, three hundred three million, one hundred thirty thousand, three hundred twenty-one".