21198199398 has 16 divisors (see below), whose sum is σ = 42552846336. Its totient is φ = 7039991880.

The previous prime is 21198199369. The next prime is 21198199423. The reversal of 21198199398 is 89399189112.

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 7 ways as a sum of consecutive naturals, for example, 6516886 + ... + 6520137.

It is an arithmetic number, because the mean of its divisors is an integer number (2659552896).

Almost surely, 2^21198199398 is an apocalyptic number.

21198199398 is an abundant number, since it is smaller than the sum of its proper divisors (21354646938).

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

21198199398 is a wasteful number, since it uses less digits than its factorization.

21198199398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13037299.

The product of its digits is 2519424, while the sum is 60.

The spelling of 21198199398 in words is "twenty-one billion, one hundred ninety-eight million, one hundred ninety-nine thousand, three hundred ninety-eight".