21853687670 has 16 divisors (see below), whose sum is σ = 39338474688. Its totient is φ = 8741066880.

The previous prime is 21853687651. The next prime is 21853687679. The reversal of 21853687670 is 7678635812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21853687679) 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 7 ways as a sum of consecutive naturals, for example, 270035 + ... + 341505.

It is an arithmetic number, because the mean of its divisors is an integer number (2458654668).

Almost surely, 2^21853687670 is an apocalyptic number.

21853687670 is a deficient number, since it is larger than the sum of its proper divisors (17484787018).

21853687670 is a wasteful number, since it uses less digits than its factorization.

21853687670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102055.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 21853687670 in words is "twenty-one billion, eight hundred fifty-three million, six hundred eighty-seven thousand, six hundred seventy".