21328417248 has 96 divisors (see below), whose sum is σ = 56675469312. Its totient is φ = 7022400000.

The previous prime is 21328417241. The next prime is 21328417261. The reversal of 21328417248 is 84271482312.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21328417241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4486873 + ... + 4491623.

It is an arithmetic number, because the mean of its divisors is an integer number (590369472).

Almost surely, 2^21328417248 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 21328417248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28337734656).

21328417248 is an abundant number, since it is smaller than the sum of its proper divisors (35347052064).

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

21328417248 is a wasteful number, since it uses less digits than its factorization.

21328417248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328 (or 5320 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The spelling of 21328417248 in words is "twenty-one billion, three hundred twenty-eight million, four hundred seventeen thousand, two hundred forty-eight".