21315936186 has 96 divisors (see below), whose sum is σ = 48861933120. Its totient is φ = 6962661504.

The previous prime is 21315936151. The next prime is 21315936209. The reversal of 21315936186 is 68163951312.

21315936186 is a `hidden beast` number, since 2 + 13 + 15 + 9 + 3 + 618 + 6 = 666.

Its product of digits (233280) is a multiple of the sum of its prime divisors (2430).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10694406 + ... + 10696398.

It is an arithmetic number, because the mean of its divisors is an integer number (508978470).

Almost surely, 2^21315936186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21315936186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24430966560).

21315936186 is an abundant number, since it is smaller than the sum of its proper divisors (27545996934).

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

21315936186 is a wasteful number, since it uses less digits than its factorization.

21315936186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442 (or 2430 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 21315936186 in words is "twenty-one billion, three hundred fifteen million, nine hundred thirty-six thousand, one hundred eighty-six".