21806090678 has 8 divisors (see below), whose sum is σ = 32709835368. Its totient is φ = 10902812224.

The previous prime is 21806090623. The next prime is 21806090693. The reversal of 21806090678 is 87609060812.

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

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 45350 + ... + 213702.

It is an arithmetic number, because the mean of its divisors is an integer number (4088729421).

Almost surely, 2^21806090678 is an apocalyptic number.

21806090678 is a deficient number, since it is larger than the sum of its proper divisors (10903744690).

21806090678 is a wasteful number, since it uses less digits than its factorization.

21806090678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233118.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 21806090678 in words is "twenty-one billion, eight hundred six million, ninety thousand, six hundred seventy-eight".