21422543663 has 2 divisors, whose sum is σ = 21422543664. Its totient is φ = 21422543662.

The previous prime is 21422543651. The next prime is 21422543671. The reversal of 21422543663 is 36634522412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21422543663 - 2¹⁴ = 21422527279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422543603) 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, 10711271831 + 10711271832.

It is an arithmetic number, because the mean of its divisors is an integer number (10711271832).

Almost surely, 2^21422543663 is an apocalyptic number.

21422543663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422543663 is an equidigital number, since it uses as much as digits as its factorization.

21422543663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 38.

The spelling of 21422543663 in words is "twenty-one billion, four hundred twenty-two million, five hundred forty-three thousand, six hundred sixty-three".