21163578327 has 24 divisors (see below), whose sum is σ = 32142183840. Its totient is φ = 13399202880.

The previous prime is 21163578287. The next prime is 21163578349. The reversal of 21163578327 is 72387536112.

21163578327 is a `hidden beast` number, since 2 + 1 + 1 + 635 + 7 + 8 + 3 + 2 + 7 = 666.

It is not a de Polignac number, because 21163578327 - 2¹² = 21163574231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163578367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648723 + ... + 680564.

It is an arithmetic number, because the mean of its divisors is an integer number (1339257660).

Almost surely, 2^21163578327 is an apocalyptic number.

21163578327 is a deficient number, since it is larger than the sum of its proper divisors (10978605513).

21163578327 is a wasteful number, since it uses less digits than its factorization.

21163578327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329383 (or 1329380 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 21163578327 in words is "twenty-one billion, one hundred sixty-three million, five hundred seventy-eight thousand, three hundred twenty-seven".