21883198 has 4 divisors (see below), whose sum is σ = 32824800. Its totient is φ = 10941598.

The previous prime is 21883181. The next prime is 21883207. The reversal of 21883198 is 89138812.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21883198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5470798 + ... + 5470801.

It is an arithmetic number, because the mean of its divisors is an integer number (8206200).

Almost surely, 2^21883198 is an apocalyptic number.

21883198 is a deficient number, since it is larger than the sum of its proper divisors (10941602).

21883198 is a wasteful number, since it uses less digits than its factorization.

21883198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10941601.

The product of its digits is 27648, while the sum is 40.

The square root of 21883198 is about 4677.9480544358. The cubic root of 21883198 is about 279.7071683452.

The spelling of 21883198 in words is "twenty-one million, eight hundred eighty-three thousand, one hundred ninety-eight".