21496409863 has 2 divisors, whose sum is σ = 21496409864. Its totient is φ = 21496409862.

The previous prime is 21496409833. The next prime is 21496409899. The reversal of 21496409863 is 36890469412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21496409863 - 2⁹ = 21496409351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21496409863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21496409833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748204931 + 10748204932.

It is an arithmetic number, because the mean of its divisors is an integer number (10748204932).

Almost surely, 2^21496409863 is an apocalyptic number.

21496409863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496409863 is an equidigital number, since it uses as much as digits as its factorization.

21496409863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 21496409863 in words is "twenty-one billion, four hundred ninety-six million, four hundred nine thousand, eight hundred sixty-three".