21898192 has 20 divisors (see below), whose sum is σ = 42827616. Its totient is φ = 10845920.

The previous prime is 21898189. The next prime is 21898237. The reversal of 21898192 is 29189812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4684 + ... + 8107.

Almost surely, 2^21898192 is an apocalyptic number.

It is an amenable number.

21898192 is a deficient number, since it is larger than the sum of its proper divisors (20929424).

21898192 is a wasteful number, since it uses less digits than its factorization.

21898192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906 (or 12900 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 21898192 is about 4679.5504057548. The cubic root of 21898192 is about 279.7710373126.

The spelling of 21898192 in words is "twenty-one million, eight hundred ninety-eight thousand, one hundred ninety-two".