21804756411 has 16 divisors (see below), whose sum is σ = 29174745600. Its totient is φ = 14485718208.

The previous prime is 21804756371. The next prime is 21804756419. The reversal of 21804756411 is 11465740812.

It is not a de Polignac number, because 21804756411 - 2¹⁵ = 21804723643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21804756411.

It is not an unprimeable number, because it can be changed into a prime (21804756419) 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 15 ways as a sum of consecutive naturals, for example, 1119010 + ... + 1138328.

It is an arithmetic number, because the mean of its divisors is an integer number (1823421600).

Almost surely, 2^21804756411 is an apocalyptic number.

21804756411 is a deficient number, since it is larger than the sum of its proper divisors (7369989189).

21804756411 is a wasteful number, since it uses less digits than its factorization.

21804756411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20618.

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 21804756411 in words is "twenty-one billion, eight hundred four million, seven hundred fifty-six thousand, four hundred eleven".