21617108198 has 16 divisors (see below), whose sum is σ = 37757106720. Its totient is φ = 9089673216.

The previous prime is 21617108189. The next prime is 21617108213. The reversal of 21617108198 is 89180171612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14566043 + ... + 14567526.

It is an arithmetic number, because the mean of its divisors is an integer number (2359819170).

Almost surely, 2^21617108198 is an apocalyptic number.

21617108198 is a deficient number, since it is larger than the sum of its proper divisors (16139998522).

21617108198 is a wasteful number, since it uses less digits than its factorization.

21617108198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29133631.

The product of its (nonzero) digits is 48384, while the sum is 44.

The spelling of 21617108198 in words is "twenty-one billion, six hundred seventeen million, one hundred eight thousand, one hundred ninety-eight".