21710660563 has 2 divisors, whose sum is σ = 21710660564. Its totient is φ = 21710660562.

The previous prime is 21710660537. The next prime is 21710660567. The reversal of 21710660563 is 36506601712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21710660563 is a prime.

It is not a weakly prime, because it can be changed into another prime (21710660567) 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, 10855330281 + 10855330282.

It is an arithmetic number, because the mean of its divisors is an integer number (10855330282).

Almost surely, 2^21710660563 is an apocalyptic number.

21710660563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21710660563 is an equidigital number, since it uses as much as digits as its factorization.

21710660563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21710660563 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, five hundred sixty-three".