21808800685 has 48 divisors (see below), whose sum is σ = 32080803840. Its totient is φ = 14151957120.

The previous prime is 21808800683. The next prime is 21808800691. The reversal of 21808800685 is 58600880812.

It is not a de Polignac number, because 21808800685 - 2¹ = 21808800683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21808800683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5495572 + ... + 5499538.

It is an arithmetic number, because the mean of its divisors is an integer number (668350080).

Almost surely, 2^21808800685 is an apocalyptic number.

It is an amenable number.

21808800685 is a deficient number, since it is larger than the sum of its proper divisors (10272003155).

21808800685 is a wasteful number, since it uses less digits than its factorization.

21808800685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186 (or 5179 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 46.

The spelling of 21808800685 in words is "twenty-one billion, eight hundred eight million, eight hundred thousand, six hundred eighty-five".