21223130321 has 4 divisors (see below), whose sum is σ = 22340137200. Its totient is φ = 20106123444.

The previous prime is 21223130297. The next prime is 21223130339. The reversal of 21223130321 is 12303132212.

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 a de Polignac number, because none of the positive numbers 2^k-21223130321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223130293 and 21223130302.

It is not an unprimeable number, because it can be changed into a prime (21223130521) 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, 558503411 + ... + 558503448.

It is an arithmetic number, because the mean of its divisors is an integer number (5585034300).

Almost surely, 2^21223130321 is an apocalyptic number.

It is an amenable number.

21223130321 is a deficient number, since it is larger than the sum of its proper divisors (1117006879).

21223130321 is a wasteful number, since it uses less digits than its factorization.

21223130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117006878.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21223130321 its reverse (12303132212), we get a palindrome (33526262533).

The spelling of 21223130321 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty thousand, three hundred twenty-one".