21241903808 has 28 divisors (see below), whose sum is σ = 42176928600. Its totient is φ = 10614646272.

The previous prime is 21241903769. The next prime is 21241903817. The reversal of 21241903808 is 80830914212.

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, 11060 + ... + 206412.

Almost surely, 2^21241903808 is an apocalyptic number.

It is an amenable number.

21241903808 is a deficient number, since it is larger than the sum of its proper divisors (20935024792).

21241903808 is a wasteful number, since it uses less digits than its factorization.

21241903808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197064 (or 197054 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 21241903808 in words is "twenty-one billion, two hundred forty-one million, nine hundred three thousand, eight hundred eight".