21063909719 has 2 divisors, whose sum is σ = 21063909720. Its totient is φ = 21063909718.

The previous prime is 21063909697. The next prime is 21063909733. The reversal of 21063909719 is 91790936012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21063909719 - 2¹² = 21063905623 is a prime.

It is a super-2 number, since 2×21063909719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21063905719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531954859 + 10531954860.

It is an arithmetic number, because the mean of its divisors is an integer number (10531954860).

Almost surely, 2^21063909719 is an apocalyptic number.

21063909719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063909719 is an equidigital number, since it uses as much as digits as its factorization.

21063909719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 47.

The spelling of 21063909719 in words is "twenty-one billion, sixty-three million, nine hundred nine thousand, seven hundred nineteen".