21321111323 has 4 divisors (see below), whose sum is σ = 22575294360. Its totient is φ = 20066928288.

The previous prime is 21321111319. The next prime is 21321111347. The reversal of 21321111323 is 32311112312.

It is a happy number.

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 21321111323 - 2² = 21321111319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321111295 and 21321111304.

It is not an unprimeable number, because it can be changed into a prime (21321111523) 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, 627091493 + ... + 627091526.

It is an arithmetic number, because the mean of its divisors is an integer number (5643823590).

Almost surely, 2^21321111323 is an apocalyptic number.

21321111323 is a deficient number, since it is larger than the sum of its proper divisors (1254183037).

21321111323 is a wasteful number, since it uses less digits than its factorization.

21321111323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254183036.

The product of its digits is 216, while the sum is 20.

Adding to 21321111323 its reverse (32311112312), we get a palindrome (53632223635).

The spelling of 21321111323 in words is "twenty-one billion, three hundred twenty-one million, one hundred eleven thousand, three hundred twenty-three".