21598424647 has 2 divisors, whose sum is σ = 21598424648. Its totient is φ = 21598424646.

The previous prime is 21598424641. The next prime is 21598424651. The reversal of 21598424647 is 74642489512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21598424647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21598424594 and 21598424603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21598424641) 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, 10799212323 + 10799212324.

It is an arithmetic number, because the mean of its divisors is an integer number (10799212324).

Almost surely, 2^21598424647 is an apocalyptic number.

21598424647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21598424647 is an equidigital number, since it uses as much as digits as its factorization.

21598424647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 52.

The spelling of 21598424647 in words is "twenty-one billion, five hundred ninety-eight million, four hundred twenty-four thousand, six hundred forty-seven".