21322208 has 24 divisors (see below), whose sum is σ = 42874272. Its totient is φ = 10433536.

The previous prime is 21322207. The next prime is 21322229. The reversal of 21322208 is 80222312.

It is a self number, because there is not a number n which added to its sum of digits gives 21322208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5585 + ... + 8592.

It is an arithmetic number, because the mean of its divisors is an integer number (1786428).

Almost surely, 2^21322208 is an apocalyptic number.

It is an amenable number.

21322208 is an abundant number, since it is smaller than the sum of its proper divisors (21552064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21322208 is a wasteful number, since it uses less digits than its factorization.

21322208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14234 (or 14226 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21322208 is about 4617.5976437970. The cubic root of 21322208 is about 277.2962896364.

The spelling of 21322208 in words is "twenty-one million, three hundred twenty-two thousand, two hundred eight".