21225208 has 32 divisors (see below), whose sum is σ = 41121360. Its totient is φ = 10264320.

The previous prime is 21225203. The next prime is 21225209. The reversal of 21225208 is 80252212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53266 + ... + 53662.

Almost surely, 2^21225208 is an apocalyptic number.

It is an amenable number.

21225208 is a deficient number, since it is larger than the sum of its proper divisors (19896152).

21225208 is a wasteful number, since it uses less digits than its factorization.

21225208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21225208 is about 4607.0823739108. The cubic root of 21225208 is about 276.8751538945.

The spelling of 21225208 in words is "twenty-one million, two hundred twenty-five thousand, two hundred eight".