21198208 has 16 divisors (see below), whose sum is σ = 42231060. Its totient is φ = 10599040.

The previous prime is 21198187. The next prime is 21198223. The reversal of 21198208 is 80289112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×21198208² = 898728044822528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21198208.

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, 82678 + ... + 82933.

Almost surely, 2^21198208 is an apocalyptic number.

It is an amenable number.

21198208 is a deficient number, since it is larger than the sum of its proper divisors (21032852).

21198208 is an equidigital number, since it uses as much as digits as its factorization.

21198208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165625 (or 165613 counting only the distinct ones).

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

The square root of 21198208 is about 4604.1511704113. The cubic root of 21198208 is about 276.7577023366.

The spelling of 21198208 in words is "twenty-one million, one hundred ninety-eight thousand, two hundred eight".