21113198 has 8 divisors (see below), whose sum is σ = 32189160. Its totient is φ = 10383480.

The previous prime is 21113173. The next prime is 21113221. The reversal of 21113198 is 89131112.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86408 + ... + 86651.

It is an arithmetic number, because the mean of its divisors is an integer number (4023645).

Almost surely, 2^21113198 is an apocalyptic number.

21113198 is a deficient number, since it is larger than the sum of its proper divisors (11075962).

21113198 is a wasteful number, since it uses less digits than its factorization.

21113198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173122.

The product of its digits is 432, while the sum is 26.

The square root of 21113198 is about 4594.9100100002. The cubic root of 21113198 is about 276.3872513306.

The spelling of 21113198 in words is "twenty-one million, one hundred thirteen thousand, one hundred ninety-eight".