21063792903809 has 2 divisors, whose sum is σ = 21063792903810. Its totient is φ = 21063792903808.

The previous prime is 21063792903787. The next prime is 21063792903823. The reversal of 21063792903809 is 90830929736012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17359430596225 + 3704362307584 = 4166465^2 + 1924672^2 .

It is a cyclic number.

It is not a de Polignac number, because 21063792903809 - 2²⁴ = 21063776126593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21063792902809) 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, 10531896451904 + 10531896451905.

It is an arithmetic number, because the mean of its divisors is an integer number (10531896451905).

Almost surely, 2^{21063792903809} is an apocalyptic number.

It is an amenable number.

21063792903809 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063792903809 is an equidigital number, since it uses as much as digits as its factorization.

21063792903809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 21063792903809 in words is "twenty-one trillion, sixty-three billion, seven hundred ninety-two million, nine hundred three thousand, eight hundred nine".