21324310321 has 4 divisors (see below), whose sum is σ = 22251454272. Its totient is φ = 20397166372.

The previous prime is 21324310313. The next prime is 21324310333. The reversal of 21324310321 is 12301342312.

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 21324310321 - 2³ = 21324310313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21324310292 and 21324310301.

It is not an unprimeable number, because it can be changed into a prime (21324310121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463571941 + ... + 463571986.

It is an arithmetic number, because the mean of its divisors is an integer number (5562863568).

Almost surely, 2^21324310321 is an apocalyptic number.

It is an amenable number.

21324310321 is a deficient number, since it is larger than the sum of its proper divisors (927143951).

21324310321 is an equidigital number, since it uses as much as digits as its factorization.

21324310321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927143950.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21324310321 its reverse (12301342312), we get a palindrome (33625652633).

The spelling of 21324310321 in words is "twenty-one billion, three hundred twenty-four million, three hundred ten thousand, three hundred twenty-one".