21113330311 has 4 divisors (see below), whose sum is σ = 21428454712. Its totient is φ = 20798205912.

The previous prime is 21113330299. The next prime is 21113330377. The reversal of 21113330311 is 11303331112.

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 21113330311 - 2¹¹ = 21113328263 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 (21113339311) 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, 157562100 + ... + 157562233.

It is an arithmetic number, because the mean of its divisors is an integer number (5357113678).

Almost surely, 2^21113330311 is an apocalyptic number.

21113330311 is a deficient number, since it is larger than the sum of its proper divisors (315124401).

21113330311 is an equidigital number, since it uses as much as digits as its factorization.

21113330311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315124400.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21113330311 its reverse (11303331112), we get a palindrome (32416661423).

The spelling of 21113330311 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty thousand, three hundred eleven".