21828521711 has 4 divisors (see below), whose sum is σ = 21867294072. Its totient is φ = 21789749352.

The previous prime is 21828521707. The next prime is 21828521719. The reversal of 21828521711 is 11712582812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21828521711 - 2² = 21828521707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828521719) 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 in 3 ways as a sum of consecutive naturals, for example, 19385336 + ... + 19386461.

It is an arithmetic number, because the mean of its divisors is an integer number (5466823518).

Almost surely, 2^21828521711 is an apocalyptic number.

21828521711 is a deficient number, since it is larger than the sum of its proper divisors (38772361).

21828521711 is an equidigital number, since it uses as much as digits as its factorization.

21828521711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38772360.

The product of its digits is 17920, while the sum is 38.

The spelling of 21828521711 in words is "twenty-one billion, eight hundred twenty-eight million, five hundred twenty-one thousand, seven hundred eleven".