21013320893 has 2 divisors, whose sum is σ = 21013320894. Its totient is φ = 21013320892.

The previous prime is 21013320871. The next prime is 21013321003. The reversal of 21013320893 is 39802331012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18466907449 + 2546413444 = 135893^2 + 50462^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013320893 - 2¹⁴ = 21013304509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013320833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506660446 + 10506660447.

It is an arithmetic number, because the mean of its divisors is an integer number (10506660447).

Almost surely, 2^21013320893 is an apocalyptic number.

It is an amenable number.

21013320893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013320893 is an equidigital number, since it uses as much as digits as its factorization.

21013320893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21013320893 in words is "twenty-one billion, thirteen million, three hundred twenty thousand, eight hundred ninety-three".