21853687052 has 24 divisors (see below), whose sum is σ = 38559306240. Its totient is φ = 10836806400.

The previous prime is 21853687003. The next prime is 21853687081. The reversal of 21853687052 is 25078635812.

It is a junction number, because it is equal to n+sod(n) for n = 21853686988 and 21853687006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1756052 + ... + 1768452.

It is an arithmetic number, because the mean of its divisors is an integer number (1606637760).

Almost surely, 2^21853687052 is an apocalyptic number.

It is an amenable number.

21853687052 is a deficient number, since it is larger than the sum of its proper divisors (16705619188).

21853687052 is a wasteful number, since it uses less digits than its factorization.

21853687052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001 (or 15999 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 21853687052 in words is "twenty-one billion, eight hundred fifty-three million, six hundred eighty-seven thousand, fifty-two".