21717422063 has 2 divisors, whose sum is σ = 21717422064. Its totient is φ = 21717422062.

The previous prime is 21717422039. The next prime is 21717422087. The reversal of 21717422063 is 36022471712.

It is a balanced prime because it is at equal distance from previous prime (21717422039) and next prime (21717422087).

It is a cyclic number.

It is not a de Polignac number, because 21717422063 - 2²⁸ = 21448986607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21717422263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10858711031 + 10858711032.

It is an arithmetic number, because the mean of its divisors is an integer number (10858711032).

Almost surely, 2^21717422063 is an apocalyptic number.

21717422063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21717422063 is an equidigital number, since it uses as much as digits as its factorization.

21717422063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

Adding to 21717422063 its reverse (36022471712), we get a palindrome (57739893775).

The spelling of 21717422063 in words is "twenty-one billion, seven hundred seventeen million, four hundred twenty-two thousand, sixty-three".