21985853198 has 4 divisors (see below), whose sum is σ = 32978779800. Its totient is φ = 10992926598.

The previous prime is 21985853191. The next prime is 21985853231. The reversal of 21985853198 is 89135858912.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21985853191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5496463298 + ... + 5496463301.

It is an arithmetic number, because the mean of its divisors is an integer number (8244694950).

Almost surely, 2^21985853198 is an apocalyptic number.

21985853198 is a deficient number, since it is larger than the sum of its proper divisors (10992926602).

21985853198 is a wasteful number, since it uses less digits than its factorization.

21985853198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10992926601.

The product of its digits is 6220800, while the sum is 59.

The spelling of 21985853198 in words is "twenty-one billion, nine hundred eighty-five million, eight hundred fifty-three thousand, one hundred ninety-eight".