21111000198 has 8 divisors (see below), whose sum is σ = 42222000408. Its totient is φ = 7037000064.

The previous prime is 21111000193. The next prime is 21111000203. The reversal of 21111000198 is 89100011112.

21111000198 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21111000193) and next prime (21111000203).

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

21111000198 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111000191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759250011 + ... + 1759250022.

It is an arithmetic number, because the mean of its divisors is an integer number (5277750051).

Almost surely, 2^21111000198 is an apocalyptic number.

21111000198 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.

21111000198 is a wasteful number, since it uses less digits than its factorization.

21111000198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518500038.

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 21111000198 in words is "twenty-one billion, one hundred eleven million, one hundred ninety-eight", and thus it is an aban number.