21010020198 has 8 divisors (see below), whose sum is σ = 42020040408. Its totient is φ = 7003340064.

The previous prime is 21010020179. The next prime is 21010020223. The reversal of 21010020198 is 89102001012.

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

21010020198 is an admirable number.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750835011 + ... + 1750835022.

It is an arithmetic number, because the mean of its divisors is an integer number (5252505051).

Almost surely, 2^21010020198 is an apocalyptic number.

21010020198 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21010020198 is a wasteful number, since it uses less digits than its factorization.

21010020198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3501670038.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21010020198 in words is "twenty-one billion, ten million, twenty thousand, one hundred ninety-eight".