21000100198 has 32 divisors (see below), whose sum is σ = 39714209280. Its totient is φ = 8089920960.

The previous prime is 21000100181. The next prime is 21000100207. The reversal of 21000100198 is 89100100012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 752386 + ... + 779797.

It is an arithmetic number, because the mean of its divisors is an integer number (1241069040).

Almost surely, 2^21000100198 is an apocalyptic number.

21000100198 is a deficient number, since it is larger than the sum of its proper divisors (18714109082).

21000100198 is a wasteful number, since it uses less digits than its factorization.

21000100198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532292.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21000100198 in words is "twenty-one billion, one hundred thousand, one hundred ninety-eight".