21885198 has 16 divisors (see below), whose sum is σ = 45280080. Its totient is φ = 7043456.

The previous prime is 21885187. The next prime is 21885203. The reversal of 21885198 is 89158812.

It is a congruent number.

It is an unprimeable number.

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, 62715 + ... + 63062.

It is an arithmetic number, because the mean of its divisors is an integer number (2830005).

Almost surely, 2^21885198 is an apocalyptic number.

21885198 is an abundant number, since it is smaller than the sum of its proper divisors (23394882).

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

21885198 is a wasteful number, since it uses less digits than its factorization.

21885198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125811.

The product of its digits is 46080, while the sum is 42.

The square root of 21885198 is about 4678.1618184924. The cubic root of 21885198 is about 279.7156893011.

The spelling of 21885198 in words is "twenty-one million, eight hundred eighty-five thousand, one hundred ninety-eight".