21536271068 has 48 divisors (see below), whose sum is σ = 41098730400. Its totient is φ = 9815426304.

The previous prime is 21536271049. The next prime is 21536271079. The reversal of 21536271068 is 86017263512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1332371 + ... + 1348437.

It is an arithmetic number, because the mean of its divisors is an integer number (856223550).

Almost surely, 2^21536271068 is an apocalyptic number.

It is an amenable number.

21536271068 is a deficient number, since it is larger than the sum of its proper divisors (19562459332).

21536271068 is a wasteful number, since it uses less digits than its factorization.

21536271068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16406 (or 16404 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21536271068 in words is "twenty-one billion, five hundred thirty-six million, two hundred seventy-one thousand, sixty-eight".