21082171178 has 8 divisors (see below), whose sum is σ = 32643361920. Its totient is φ = 10201050540.

The previous prime is 21082171139. The next prime is 21082171213. The reversal of 21082171178 is 87117128012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170017448 + ... + 170017571.

It is an arithmetic number, because the mean of its divisors is an integer number (4080420240).

Almost surely, 2^21082171178 is an apocalyptic number.

21082171178 is a deficient number, since it is larger than the sum of its proper divisors (11561190742).

21082171178 is a wasteful number, since it uses less digits than its factorization.

21082171178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340035052.

The product of its (nonzero) digits is 12544, while the sum is 38.

The spelling of 21082171178 in words is "twenty-one billion, eighty-two million, one hundred seventy-one thousand, one hundred seventy-eight".