21745982711 has 2 divisors, whose sum is σ = 21745982712. Its totient is φ = 21745982710.

The previous prime is 21745982693. The next prime is 21745982767. The reversal of 21745982711 is 11728954712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21745982711 - 2²⁶ = 21678873847 is a prime.

It is a super-2 number, since 2×21745982711² (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 (21745982411) 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, 10872991355 + 10872991356.

It is an arithmetic number, because the mean of its divisors is an integer number (10872991356).

Almost surely, 2^21745982711 is an apocalyptic number.

21745982711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21745982711 is an equidigital number, since it uses as much as digits as its factorization.

21745982711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The spelling of 21745982711 in words is "twenty-one billion, seven hundred forty-five million, nine hundred eighty-two thousand, seven hundred eleven".