21320032013 has 4 divisors (see below), whose sum is σ = 24365750880. Its totient is φ = 18274313148.

The previous prime is 21320032007. The next prime is 21320032037. The reversal of 21320032013 is 31023002312.

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 21320032013 - 2⁸ = 21320031757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320031982 and 21320032000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320032043) 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, 1522859423 + ... + 1522859436.

It is an arithmetic number, because the mean of its divisors is an integer number (6091437720).

Almost surely, 2^21320032013 is an apocalyptic number.

It is an amenable number.

21320032013 is a deficient number, since it is larger than the sum of its proper divisors (3045718867).

21320032013 is an equidigital number, since it uses as much as digits as its factorization.

21320032013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045718866.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21320032013 its reverse (31023002312), we get a palindrome (52343034325).

The spelling of 21320032013 in words is "twenty-one billion, three hundred twenty million, thirty-two thousand, thirteen".