21536930563 has 2 divisors, whose sum is σ = 21536930564. Its totient is φ = 21536930562.

The previous prime is 21536930551. The next prime is 21536930567. The reversal of 21536930563 is 36503963512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21536930563 - 2¹⁷ = 21536799491 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536930567) 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, 10768465281 + 10768465282.

It is an arithmetic number, because the mean of its divisors is an integer number (10768465282).

Almost surely, 2^21536930563 is an apocalyptic number.

21536930563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536930563 is an equidigital number, since it uses as much as digits as its factorization.

21536930563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 43.

The spelling of 21536930563 in words is "twenty-one billion, five hundred thirty-six million, nine hundred thirty thousand, five hundred sixty-three".