21323211211 has 4 divisors (see below), whose sum is σ = 21323589624. Its totient is φ = 21322832800.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211211 is 11211232312.

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 21323211211 - 2¹¹ = 21323209163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323211241) 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, 85870 + ... + 223651.

It is an arithmetic number, because the mean of its divisors is an integer number (5330897406).

Almost surely, 2^21323211211 is an apocalyptic number.

21323211211 is a deficient number, since it is larger than the sum of its proper divisors (378413).

21323211211 is an equidigital number, since it uses as much as digits as its factorization.

21323211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378412.

The product of its digits is 144, while the sum is 19.

Adding to 21323211211 its reverse (11211232312), we get a palindrome (32534443523).

The spelling of 21323211211 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred eleven".