21118078170 has 48 divisors (see below), whose sum is σ = 62750862720. Its totient is φ = 4826989152.

The previous prime is 21118078151. The next prime is 21118078207. The reversal of 21118078170 is 7187081112.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16759750 + ... + 16761009.

It is an arithmetic number, because the mean of its divisors is an integer number (1307309640).

Almost surely, 2^21118078170 is an apocalyptic number.

21118078170 is an abundant number, since it is smaller than the sum of its proper divisors (41632784550).

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

21118078170 is a wasteful number, since it uses less digits than its factorization.

21118078170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33520779 (or 33520776 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 36.

The spelling of 21118078170 in words is "twenty-one billion, one hundred eighteen million, seventy-eight thousand, one hundred seventy".