21340322013 has 4 divisors (see below), whose sum is σ = 28453762688. Its totient is φ = 14226881340.

The previous prime is 21340322009. The next prime is 21340322027. The reversal of 21340322013 is 31022304312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21340322013 - 2² = 21340322009 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 (21340322063) 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, 3556720333 + ... + 3556720338.

It is an arithmetic number, because the mean of its divisors is an integer number (7113440672).

Almost surely, 2^21340322013 is an apocalyptic number.

It is an amenable number.

21340322013 is a deficient number, since it is larger than the sum of its proper divisors (7113440675).

21340322013 is an equidigital number, since it uses as much as digits as its factorization.

21340322013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7113440674.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21340322013 its reverse (31022304312), we get a palindrome (52362626325).

The spelling of 21340322013 in words is "twenty-one billion, three hundred forty million, three hundred twenty-two thousand, thirteen".