21305341311 has 16 divisors (see below), whose sum is σ = 29329133568. Its totient is φ = 13748011200.

The previous prime is 21305341271. The next prime is 21305341313. The reversal of 21305341311 is 11314350312.

It is not a de Polignac number, because 21305341311 - 2¹⁴ = 21305324927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305341313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666325 + ... + 697566.

It is an arithmetic number, because the mean of its divisors is an integer number (1833070848).

Almost surely, 2^21305341311 is an apocalyptic number.

21305341311 is a deficient number, since it is larger than the sum of its proper divisors (8023792257).

21305341311 is a wasteful number, since it uses less digits than its factorization.

21305341311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364062.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21305341311 its reverse (11314350312), we get a palindrome (32619691623).

Subtracting from 21305341311 its reverse (11314350312), we obtain a palindrome (9990990999).

The spelling of 21305341311 in words is "twenty-one billion, three hundred five million, three hundred forty-one thousand, three hundred eleven".