21795502679 has 2 divisors, whose sum is σ = 21795502680. Its totient is φ = 21795502678.

The previous prime is 21795502657. The next prime is 21795502691. The reversal of 21795502679 is 97620559712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21795502679 - 2²⁸ = 21527067223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21795502679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21795502649) 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, 10897751339 + 10897751340.

It is an arithmetic number, because the mean of its divisors is an integer number (10897751340).

Almost surely, 2^21795502679 is an apocalyptic number.

21795502679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21795502679 is an equidigital number, since it uses as much as digits as its factorization.

21795502679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2381400, while the sum is 53.

The spelling of 21795502679 in words is "twenty-one billion, seven hundred ninety-five million, five hundred two thousand, six hundred seventy-nine".