21224137208 has 16 divisors (see below), whose sum is σ = 39983863560. Its totient is φ = 10561773600.

The previous prime is 21224137163. The next prime is 21224137213. The reversal of 21224137208 is 80273142212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6285083 + ... + 6288458.

Almost surely, 2^21224137208 is an apocalyptic number.

It is an amenable number.

21224137208 is a deficient number, since it is larger than the sum of its proper divisors (18759726352).

21224137208 is a wasteful number, since it uses less digits than its factorization.

21224137208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12573758 (or 12573754 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 21224137208 in words is "twenty-one billion, two hundred twenty-four million, one hundred thirty-seven thousand, two hundred eight".