21320038013 has 2 divisors, whose sum is σ = 21320038014. Its totient is φ = 21320038012.

The previous prime is 21320038009. The next prime is 21320038027. The reversal of 21320038013 is 31083002312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17094778009 + 4225260004 = 130747^2 + 65002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320038013 - 2² = 21320038009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21320038013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320038613) 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 as a sum of consecutive naturals, namely, 10660019006 + 10660019007.

It is an arithmetic number, because the mean of its divisors is an integer number (10660019007).

Almost surely, 2^21320038013 is an apocalyptic number.

It is an amenable number.

21320038013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320038013 is an equidigital number, since it uses as much as digits as its factorization.

21320038013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 21320038013 in words is "twenty-one billion, three hundred twenty million, thirty-eight thousand, thirteen".