21323001323 has 16 divisors (see below), whose sum is σ = 23577153600. Its totient is φ = 19158750720.

The previous prime is 21323001319. The next prime is 21323001353. The reversal of 21323001323 is 32310032312.

It is a cyclic number.

It is not a de Polignac number, because 21323001323 - 2² = 21323001319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323001295 and 21323001304.

It is not an unprimeable number, because it can be changed into a prime (21323001353) 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 15 ways as a sum of consecutive naturals, for example, 188423 + ... + 279551.

It is an arithmetic number, because the mean of its divisors is an integer number (1473572100).

Almost surely, 2^21323001323 is an apocalyptic number.

21323001323 is a deficient number, since it is larger than the sum of its proper divisors (2254152277).

21323001323 is a wasteful number, since it uses less digits than its factorization.

21323001323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91622.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21323001323 its reverse (32310032312), we get a palindrome (53633033635).

The spelling of 21323001323 in words is "twenty-one billion, three hundred twenty-three million, one thousand, three hundred twenty-three".