21613263593 has 2 divisors, whose sum is σ = 21613263594. Its totient is φ = 21613263592.

The previous prime is 21613263587. The next prime is 21613263641. The reversal of 21613263593 is 39536231612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15328420864 + 6284842729 = 123808^2 + 79277^2 .

It is a cyclic number.

It is not a de Polignac number, because 21613263593 - 2⁸ = 21613263337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21613263593.

It is not a weakly prime, because it can be changed into another prime (21613263533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806631796 + 10806631797.

It is an arithmetic number, because the mean of its divisors is an integer number (10806631797).

Almost surely, 2^21613263593 is an apocalyptic number.

It is an amenable number.

21613263593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613263593 is an equidigital number, since it uses as much as digits as its factorization.

21613263593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 41.

The spelling of 21613263593 in words is "twenty-one billion, six hundred thirteen million, two hundred sixty-three thousand, five hundred ninety-three".