21827486647 has 2 divisors, whose sum is σ = 21827486648. Its totient is φ = 21827486646.

The previous prime is 21827486641. The next prime is 21827486677. The reversal of 21827486647 is 74668472812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21827486647 - 2¹⁹ = 21826962359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21827486641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10913743323 + 10913743324.

It is an arithmetic number, because the mean of its divisors is an integer number (10913743324).

Almost surely, 2^21827486647 is an apocalyptic number.

21827486647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21827486647 is an equidigital number, since it uses as much as digits as its factorization.

21827486647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 55.

The spelling of 21827486647 in words is "twenty-one billion, eight hundred twenty-seven million, four hundred eighty-six thousand, six hundred forty-seven".