21459009084 has 24 divisors (see below), whose sum is σ = 53016375888. Its totient is φ = 6732238080.

The previous prime is 21459009083. The next prime is 21459009097. The reversal of 21459009084 is 48090095412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21459009083) 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, 52595407 + ... + 52595814.

It is an arithmetic number, because the mean of its divisors is an integer number (2209015662).

Almost surely, 2^21459009084 is an apocalyptic number.

It is an amenable number.

21459009084 is an abundant number, since it is smaller than the sum of its proper divisors (31557366804).

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

21459009084 is a wasteful number, since it uses less digits than its factorization.

21459009084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105191245 (or 105191243 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 21459009084 in words is "twenty-one billion, four hundred fifty-nine million, nine thousand, eighty-four".