21085663186 has 32 divisors (see below), whose sum is σ = 37450512000. Its totient is φ = 8711751552.

The previous prime is 21085663133. The next prime is 21085663199. The reversal of 21085663186 is 68136658012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228150 + ... + 306958.

It is an arithmetic number, because the mean of its divisors is an integer number (1170328500).

Almost surely, 2^21085663186 is an apocalyptic number.

21085663186 is a deficient number, since it is larger than the sum of its proper divisors (16364848814).

21085663186 is a wasteful number, since it uses less digits than its factorization.

21085663186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79506.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 21085663186 in words is "twenty-one billion, eighty-five million, six hundred sixty-three thousand, one hundred eighty-six".