21320430013 has 4 divisors (see below), whose sum is σ = 21336793888. Its totient is φ = 21304066140.

The previous prime is 21320429993. The next prime is 21320430023. The reversal of 21320430013 is 31003402312.

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 a cyclic number.

It is not a de Polignac number, because 21320430013 - 2⁵ = 21320429981 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 (21320430023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8179983 + ... + 8182588.

It is an arithmetic number, because the mean of its divisors is an integer number (5334198472).

Almost surely, 2^21320430013 is an apocalyptic number.

It is an amenable number.

21320430013 is a deficient number, since it is larger than the sum of its proper divisors (16363875).

21320430013 is a wasteful number, since it uses less digits than its factorization.

21320430013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16363874.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320430013 its reverse (31003402312), we get a palindrome (52323832325).

The spelling of 21320430013 in words is "twenty-one billion, three hundred twenty million, four hundred thirty thousand, thirteen".