21668883263 has 2 divisors, whose sum is σ = 21668883264. Its totient is φ = 21668883262.

The previous prime is 21668883251. The next prime is 21668883287. The reversal of 21668883263 is 36238886612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21668883263 - 2⁶ = 21668883199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21668883163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10834441631 + 10834441632.

It is an arithmetic number, because the mean of its divisors is an integer number (10834441632).

Almost surely, 2^21668883263 is an apocalyptic number.

21668883263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21668883263 is an equidigital number, since it uses as much as digits as its factorization.

21668883263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 53.

The spelling of 21668883263 in words is "twenty-one billion, six hundred sixty-eight million, eight hundred eighty-three thousand, two hundred sixty-three".