21573763559 has 2 divisors, whose sum is σ = 21573763560. Its totient is φ = 21573763558.

The previous prime is 21573763543. The next prime is 21573763573. The reversal of 21573763559 is 95536737512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21573763559 - 2⁴ = 21573763543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21573763559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21573763529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10786881779 + 10786881780.

It is an arithmetic number, because the mean of its divisors is an integer number (10786881780).

Almost surely, 2^21573763559 is an apocalyptic number.

21573763559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21573763559 is an equidigital number, since it uses as much as digits as its factorization.

21573763559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5953500, while the sum is 53.

The spelling of 21573763559 in words is "twenty-one billion, five hundred seventy-three million, seven hundred sixty-three thousand, five hundred fifty-nine".