21847304640 has 336 divisors, whose sum is σ = 81725414400. Its totient is φ = 4929619968.

The previous prime is 21847304623. The next prime is 21847304659. The reversal of 21847304640 is 4640374812.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3713221 + ... + 3719099.

It is an arithmetic number, because the mean of its divisors is an integer number (243230400).

Almost surely, 2^21847304640 is an apocalyptic number.

21847304640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21847304640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40862707200).

21847304640 is an abundant number, since it is smaller than the sum of its proper divisors (59878109760).

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

21847304640 is a wasteful number, since it uses less digits than its factorization.

21847304640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992 (or 5975 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The spelling of 21847304640 in words is "twenty-one billion, eight hundred forty-seven million, three hundred four thousand, six hundred forty".