21853853683 has 4 divisors (see below), whose sum is σ = 21864766248. Its totient is φ = 21842941120.

The previous prime is 21853853677. The next prime is 21853853699. The reversal of 21853853683 is 38635835812.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21853853683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21853853683.

It is not an unprimeable number, because it can be changed into a prime (21853853183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5453278 + ... + 5457283.

It is an arithmetic number, because the mean of its divisors is an integer number (5466191562).

Almost surely, 2^21853853683 is an apocalyptic number.

21853853683 is a deficient number, since it is larger than the sum of its proper divisors (10912565).

21853853683 is a wasteful number, since it uses less digits than its factorization.

21853853683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10912564.

The product of its digits is 4147200, while the sum is 52.

The spelling of 21853853683 in words is "twenty-one billion, eight hundred fifty-three million, eight hundred fifty-three thousand, six hundred eighty-three".