21363702593 has 2 divisors, whose sum is σ = 21363702594. Its totient is φ = 21363702592.

The previous prime is 21363702589. The next prime is 21363702617. The reversal of 21363702593 is 39520736312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17085626944 + 4278075649 = 130712^2 + 65407^2 .

It is a cyclic number.

It is not a de Polignac number, because 21363702593 - 2² = 21363702589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21363702593.

It is not a weakly prime, because it can be changed into another prime (21363702523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681851296 + 10681851297.

It is an arithmetic number, because the mean of its divisors is an integer number (10681851297).

Almost surely, 2^21363702593 is an apocalyptic number.

It is an amenable number.

21363702593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21363702593 is an equidigital number, since it uses as much as digits as its factorization.

21363702593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 41.

The spelling of 21363702593 in words is "twenty-one billion, three hundred sixty-three million, seven hundred two thousand, five hundred ninety-three".