21259065198 has 16 divisors (see below), whose sum is σ = 48592149120. Its totient is φ = 6074018616.

The previous prime is 21259065187. The next prime is 21259065229. The reversal of 21259065198 is 89156095212.

21259065198 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253084068 + ... + 253084151.

It is an arithmetic number, because the mean of its divisors is an integer number (3037009320).

Almost surely, 2^21259065198 is an apocalyptic number.

21259065198 is an abundant number, since it is smaller than the sum of its proper divisors (27333083922).

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

21259065198 is a wasteful number, since it uses less digits than its factorization.

21259065198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506168231.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 21259065198 in words is "twenty-one billion, two hundred fifty-nine million, sixty-five thousand, one hundred ninety-eight".