21441503648 has 96 divisors (see below), whose sum is σ = 46049472000. Its totient is φ = 9790018560.

The previous prime is 21441503581. The next prime is 21441503653. The reversal of 21441503648 is 84630514412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5067998 + ... + 5072226.

It is an arithmetic number, because the mean of its divisors is an integer number (479682000).

Almost surely, 2^21441503648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21441503648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23024736000).

21441503648 is an abundant number, since it is smaller than the sum of its proper divisors (24607968352).

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

21441503648 is a wasteful number, since it uses less digits than its factorization.

21441503648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558 (or 4550 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 21441503648 in words is "twenty-one billion, four hundred forty-one million, five hundred three thousand, six hundred forty-eight".