21100198 has 16 divisors (see below), whose sum is σ = 36309024. Its totient is φ = 9008640.

The previous prime is 21100193. The next prime is 21100207. The reversal of 21100198 is 89100112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (2269314).

Almost surely, 2^21100198 is an apocalyptic number.

21100198 is a deficient number, since it is larger than the sum of its proper divisors (15208826).

21100198 is a wasteful number, since it uses less digits than its factorization.

21100198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5727.

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

The square root of 21100198 is about 4593.4951834088. The cubic root of 21100198 is about 276.3305131714.

The spelling of 21100198 in words is "twenty-one million, one hundred thousand, one hundred ninety-eight".