21163315190779 has 2 divisors, whose sum is σ = 21163315190780. Its totient is φ = 21163315190778.

The previous prime is 21163315190761. The next prime is 21163315190833. The reversal of 21163315190779 is 97709151336112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21163315190779 - 2¹¹ = 21163315188731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21163315890779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581657595389 + 10581657595390.

It is an arithmetic number, because the mean of its divisors is an integer number (10581657595390).

Almost surely, 2^{21163315190779} is an apocalyptic number.

21163315190779 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163315190779 is an equidigital number, since it uses as much as digits as its factorization.

21163315190779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The spelling of 21163315190779 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred fifteen million, one hundred ninety thousand, seven hundred seventy-nine".