21233311211 has 4 divisors (see below), whose sum is σ = 24266641392. Its totient is φ = 18199981032.

The previous prime is 21233311193. The next prime is 21233311223. The reversal of 21233311211 is 11211333212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233311211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233310211) 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, 1516665080 + ... + 1516665093.

It is an arithmetic number, because the mean of its divisors is an integer number (6066660348).

Almost surely, 2^21233311211 is an apocalyptic number.

21233311211 is a deficient number, since it is larger than the sum of its proper divisors (3033330181).

21233311211 is an equidigital number, since it uses as much as digits as its factorization.

21233311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033330180.

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

Adding to 21233311211 its reverse (11211333212), we get a palindrome (32444644423).

The spelling of 21233311211 in words is "twenty-one billion, two hundred thirty-three million, three hundred eleven thousand, two hundred eleven".