21163041918 has 24 divisors (see below), whose sum is σ = 45885855600. Its totient is φ = 7049332224.

The previous prime is 21163041869. The next prime is 21163041937. The reversal of 21163041918 is 81914036112.

21163041918 is a `hidden beast` number, since 2 + 1 + 1 + 630 + 4 + 1 + 9 + 18 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 391858 + ... + 442581.

It is an arithmetic number, because the mean of its divisors is an integer number (1911910650).

Almost surely, 2^21163041918 is an apocalyptic number.

21163041918 is an abundant number, since it is smaller than the sum of its proper divisors (24722813682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21163041918 is a wasteful number, since it uses less digits than its factorization.

21163041918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835856 (or 835853 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 21163041918 in words is "twenty-one billion, one hundred sixty-three million, forty-one thousand, nine hundred eighteen".