21647109728983 has 2 divisors, whose sum is σ = 21647109728984. Its totient is φ = 21647109728982.

The previous prime is 21647109728963. The next prime is 21647109729001. The reversal of 21647109728983 is 38982790174612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21647109728983 - 2⁹ = 21647109728471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21647109728963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10823554864491 + 10823554864492.

It is an arithmetic number, because the mean of its divisors is an integer number (10823554864492).

Almost surely, 2^{21647109728983} is an apocalyptic number.

21647109728983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21647109728983 is an equidigital number, since it uses as much as digits as its factorization.

21647109728983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 21647109728983 in words is "twenty-one trillion, six hundred forty-seven billion, one hundred nine million, seven hundred twenty-eight thousand, nine hundred eighty-three".