21321201323 has 4 divisors (see below), whose sum is σ = 21613272648. Its totient is φ = 21029130000.

The previous prime is 21321201311. The next prime is 21321201353. The reversal of 21321201323 is 32310212312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21321201323 - 2²⁰ = 21320152747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321201295 and 21321201304.

It is not an unprimeable number, because it can be changed into a prime (21321201353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146035553 + ... + 146035698.

It is an arithmetic number, because the mean of its divisors is an integer number (5403318162).

Almost surely, 2^21321201323 is an apocalyptic number.

21321201323 is a deficient number, since it is larger than the sum of its proper divisors (292071325).

21321201323 is an equidigital number, since it uses as much as digits as its factorization.

21321201323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292071324.

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

Adding to 21321201323 its reverse (32310212312), we get a palindrome (53631413635).

The spelling of 21321201323 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred twenty-three".