21031322321 has 8 divisors (see below), whose sum is σ = 22002672384. Its totient is φ = 20081800480.

The previous prime is 21031322293. The next prime is 21031322327. The reversal of 21031322321 is 12322313012.

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-21031322321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031322293 and 21031322302.

It is not an unprimeable number, because it can be changed into a prime (21031322327) 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, 5455085 + ... + 5458938.

It is an arithmetic number, because the mean of its divisors is an integer number (2750334048).

Almost surely, 2^21031322321 is an apocalyptic number.

It is an amenable number.

21031322321 is a deficient number, since it is larger than the sum of its proper divisors (971350063).

21031322321 is a wasteful number, since it uses less digits than its factorization.

21031322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10914111.

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

Adding to 21031322321 its reverse (12322313012), we get a palindrome (33353635333).

The spelling of 21031322321 in words is "twenty-one billion, thirty-one million, three hundred twenty-two thousand, three hundred twenty-one".