21199208 has 16 divisors (see below), whose sum is σ = 40401060. Its totient is φ = 10425600.

The previous prime is 21199207. The next prime is 21199219. The reversal of 21199208 is 80299112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18164644 + 3034564 = 4262^2 + 1742^2 .

It is not an unprimeable number, because it can be changed into a prime (21199201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21233 + ... + 22208.

Almost surely, 2^21199208 is an apocalyptic number.

It is an amenable number.

21199208 is a deficient number, since it is larger than the sum of its proper divisors (19201852).

21199208 is a wasteful number, since it uses less digits than its factorization.

21199208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43508 (or 43504 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 21199208 is about 4604.2597667812. The cubic root of 21199208 is about 276.7620541722.

The spelling of 21199208 in words is "twenty-one million, one hundred ninety-nine thousand, two hundred eight".