21163578367 has 2 divisors, whose sum is σ = 21163578368. Its totient is φ = 21163578366.

The previous prime is 21163578353. The next prime is 21163578377. The reversal of 21163578367 is 76387536112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21163578367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21163578367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21163578377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581789183 + 10581789184.

It is an arithmetic number, because the mean of its divisors is an integer number (10581789184).

Almost surely, 2^21163578367 is an apocalyptic number.

21163578367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163578367 is an equidigital number, since it uses as much as digits as its factorization.

21163578367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The spelling of 21163578367 in words is "twenty-one billion, one hundred sixty-three million, five hundred seventy-eight thousand, three hundred sixty-seven".