21233310311 has 4 divisors (see below), whose sum is σ = 21245824272. Its totient is φ = 21220796352.

The previous prime is 21233310257. The next prime is 21233310317. The reversal of 21233310311 is 11301333212.

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 21233310311 - 2²⁶ = 21166201447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233310317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6254435 + ... + 6257828.

It is an arithmetic number, because the mean of its divisors is an integer number (5311456068).

Almost surely, 2^21233310311 is an apocalyptic number.

21233310311 is a deficient number, since it is larger than the sum of its proper divisors (12513961).

21233310311 is a wasteful number, since it uses less digits than its factorization.

21233310311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12513960.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21233310311 its reverse (11301333212), we get a palindrome (32534643523).

The spelling of 21233310311 in words is "twenty-one billion, two hundred thirty-three million, three hundred ten thousand, three hundred eleven".