27863505021 has 12 divisors (see below), whose sum is σ = 40835770976. Its totient is φ = 16886972520.

The previous prime is 27863505001. The next prime is 27863505037. The reversal of 27863505021 is 12050536872.

It is not a de Polignac number, because 27863505021 - 2⁵ = 27863504989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27863505001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38379121 + ... + 38379846.

Almost surely, 2^27863505021 is an apocalyptic number.

It is an amenable number.

27863505021 is a deficient number, since it is larger than the sum of its proper divisors (12972265955).

27863505021 is a wasteful number, since it uses less digits than its factorization.

27863505021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76758992 (or 76758981 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 27863505021 in words is "twenty-seven billion, eight hundred sixty-three million, five hundred five thousand, twenty-one".