21321123320323 has 8 divisors (see below), whose sum is σ = 21787826568192. Its totient is φ = 20854964336136.

The previous prime is 21321123320191. The next prime is 21321123320327. The reversal of 21321123320323 is 32302332112312.

It is a happy number.

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-21321123320323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321123320291 and 21321123320300.

It is not an unprimeable number, because it can be changed into a prime (21321123320327) 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, 135986715 + ... + 136143412.

It is an arithmetic number, because the mean of its divisors is an integer number (2723478321024).

Almost surely, 2^{21321123320323} is an apocalyptic number.

21321123320323 is a deficient number, since it is larger than the sum of its proper divisors (466703247869).

21321123320323 is a wasteful number, since it uses less digits than its factorization.

21321123320323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272131841.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21321123320323 its reverse (32302332112312), we get a palindrome (53623455432635).

The spelling of 21321123320323 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-three million, three hundred twenty thousand, three hundred twenty-three".