21443406908 has 24 divisors (see below), whose sum is σ = 46785615744. Its totient is φ = 8354574000.

The previous prime is 21443406871. The next prime is 21443406913. The reversal of 21443406908 is 80960434412.

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 7 ways as a sum of consecutive naturals, for example, 34810418 + ... + 34811033.

It is an arithmetic number, because the mean of its divisors is an integer number (1949400656).

Almost surely, 2^21443406908 is an apocalyptic number.

21443406908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21443406908 is an abundant number, since it is smaller than the sum of its proper divisors (25342208836).

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

21443406908 is a wasteful number, since it uses less digits than its factorization.

21443406908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69621473 (or 69621471 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 21443406908 in words is "twenty-one billion, four hundred forty-three million, four hundred six thousand, nine hundred eight".