21300321311 has 4 divisors (see below), whose sum is σ = 21302212800. Its totient is φ = 21298429824.

The previous prime is 21300321253. The next prime is 21300321323. The reversal of 21300321311 is 11312300312.

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 21300321311 - 2²² = 21296127007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21300321311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300321391) 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, 928751 + ... + 951408.

It is an arithmetic number, because the mean of its divisors is an integer number (5325553200).

Almost surely, 2^21300321311 is an apocalyptic number.

21300321311 is a deficient number, since it is larger than the sum of its proper divisors (1891489).

21300321311 is a wasteful number, since it uses less digits than its factorization.

21300321311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891488.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21300321311 its reverse (11312300312), we get a palindrome (32612621623).

The spelling of 21300321311 in words is "twenty-one billion, three hundred million, three hundred twenty-one thousand, three hundred eleven".