21680498578 has 8 divisors (see below), whose sum is σ = 32521402368. Its totient is φ = 10840031124.

The previous prime is 21680498569. The next prime is 21680498591. The reversal of 21680498578 is 87589408612.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82275 + ... + 223897.

It is an arithmetic number, because the mean of its divisors is an integer number (4065175296).

Almost surely, 2^21680498578 is an apocalyptic number.

21680498578 is a deficient number, since it is larger than the sum of its proper divisors (10840903790).

21680498578 is a wasteful number, since it uses less digits than its factorization.

21680498578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218168.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 21680498578 in words is "twenty-one billion, six hundred eighty million, four hundred ninety-eight thousand, five hundred seventy-eight".