21588336013 has 2 divisors, whose sum is σ = 21588336014. Its totient is φ = 21588336012.

The previous prime is 21588335983. The next prime is 21588336019. The reversal of 21588336013 is 31063388512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17020333444 + 4568002569 = 130462^2 + 67587^2 .

It is a cyclic number.

It is not a de Polignac number, because 21588336013 - 2⁵ = 21588335981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21588336019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10794168006 + 10794168007.

It is an arithmetic number, because the mean of its divisors is an integer number (10794168007).

Almost surely, 2^21588336013 is an apocalyptic number.

It is an amenable number.

21588336013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21588336013 is an equidigital number, since it uses as much as digits as its factorization.

21588336013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21588336013 in words is "twenty-one billion, five hundred eighty-eight million, three hundred thirty-six thousand, thirteen".