21323012211 has 8 divisors (see below), whose sum is σ = 31589647760. Its totient is φ = 14215341456.

The previous prime is 21323012203. The next prime is 21323012251. The reversal of 21323012211 is 11221032312.

21323012211 is a `hidden beast` number, since 213 + 230 + 1 + 221 + 1 = 666.

It is not a de Polignac number, because 21323012211 - 2³ = 21323012203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323012251) 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, 394870570 + ... + 394870623.

It is an arithmetic number, because the mean of its divisors is an integer number (3948705970).

Almost surely, 2^21323012211 is an apocalyptic number.

21323012211 is a deficient number, since it is larger than the sum of its proper divisors (10266635549).

21323012211 is an equidigital number, since it uses as much as digits as its factorization.

21323012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789741202 (or 789741196 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21323012211 its reverse (11221032312), we get a palindrome (32544044523).

The spelling of 21323012211 in words is "twenty-one billion, three hundred twenty-three million, twelve thousand, two hundred eleven".