21759477908 has 24 divisors (see below), whose sum is σ = 43528162944. Its totient is φ = 9323517600.

The previous prime is 21759477907. The next prime is 21759477959. The reversal of 21759477908 is 80977495712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21759477907) 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, 56618 + ... + 216158.

It is an arithmetic number, because the mean of its divisors is an integer number (1813673456).

Almost surely, 2^21759477908 is an apocalyptic number.

21759477908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21759477908 is an abundant number, since it is smaller than the sum of its proper divisors (21768685036).

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

21759477908 is a wasteful number, since it uses less digits than its factorization.

21759477908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164423 (or 164421 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 59.

The spelling of 21759477908 in words is "twenty-one billion, seven hundred fifty-nine million, four hundred seventy-seven thousand, nine hundred eight".