21719245711 has 2 divisors, whose sum is σ = 21719245712. Its totient is φ = 21719245710.

The previous prime is 21719245693. The next prime is 21719245721. The reversal of 21719245711 is 11754291712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21719245711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21719245721) 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, 10859622855 + 10859622856.

It is an arithmetic number, because the mean of its divisors is an integer number (10859622856).

Almost surely, 2^21719245711 is an apocalyptic number.

21719245711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21719245711 is an equidigital number, since it uses as much as digits as its factorization.

21719245711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 40.

The spelling of 21719245711 in words is "twenty-one billion, seven hundred nineteen million, two hundred forty-five thousand, seven hundred eleven".