21198930398 has 16 divisors (see below), whose sum is σ = 33189212160. Its totient is φ = 10136089656.

The previous prime is 21198930391. The next prime is 21198930409. The reversal of 21198930398 is 89303989112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21198930391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 135911 + ... + 246717.

It is an arithmetic number, because the mean of its divisors is an integer number (2074325760).

Almost surely, 2^21198930398 is an apocalyptic number.

21198930398 is a deficient number, since it is larger than the sum of its proper divisors (11990281762).

21198930398 is a wasteful number, since it uses less digits than its factorization.

21198930398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114991.

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 21198930398 in words is "twenty-one billion, one hundred ninety-eight million, nine hundred thirty thousand, three hundred ninety-eight".