21856182908 has 48 divisors (see below), whose sum is σ = 43878395904. Its totient is φ = 9331433280.

The previous prime is 21856182899. The next prime is 21856182913. The reversal of 21856182908 is 80928165812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13482338 + ... + 13483958.

It is an arithmetic number, because the mean of its divisors is an integer number (914133248).

Almost surely, 2^21856182908 is an apocalyptic number.

21856182908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21856182908 is an abundant number, since it is smaller than the sum of its proper divisors (22022212996).

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

21856182908 is a wasteful number, since it uses less digits than its factorization.

21856182908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3162 (or 3160 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 21856182908 in words is "twenty-one billion, eight hundred fifty-six million, one hundred eighty-two thousand, nine hundred eight".