21032320013 has 4 divisors (see below), whose sum is σ = 21197928960. Its totient is φ = 20866711068.

The previous prime is 21032320007. The next prime is 21032320019. The reversal of 21032320013 is 31002323012.

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 an interprime number because it is at equal distance from previous prime (21032320007) and next prime (21032320019).

It is a cyclic number.

It is not a de Polignac number, because 21032320013 - 2²⁴ = 21015542797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21032319973 and 21032320000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032320019) 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, 82804283 + ... + 82804536.

It is an arithmetic number, because the mean of its divisors is an integer number (5299482240).

Almost surely, 2^21032320013 is an apocalyptic number.

It is an amenable number.

21032320013 is a deficient number, since it is larger than the sum of its proper divisors (165608947).

21032320013 is a wasteful number, since it uses less digits than its factorization.

21032320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165608946.

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

Adding to 21032320013 its reverse (31002323012), we get a palindrome (52034643025).

The spelling of 21032320013 in words is "twenty-one billion, thirty-two million, three hundred twenty thousand, thirteen".