21802198 has 8 divisors (see below), whose sum is σ = 35676360. Its totient is φ = 9910080.

The previous prime is 21802189. The next prime is 21802243. The reversal of 21802198 is 89120812.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 495483 + ... + 495526.

It is an arithmetic number, because the mean of its divisors is an integer number (4459545).

Almost surely, 2^21802198 is an apocalyptic number.

21802198 is a deficient number, since it is larger than the sum of its proper divisors (13874162).

21802198 is a wasteful number, since it uses less digits than its factorization.

21802198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991022.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 21802198 is about 4669.2823859775. The cubic root of 21802198 is about 279.3616324367.

The spelling of 21802198 in words is "twenty-one million, eight hundred two thousand, one hundred ninety-eight".