21303012648 has 64 divisors (see below), whose sum is σ = 56155809600. Its totient is φ = 6715837440.

The previous prime is 21303012637. The next prime is 21303012701. The reversal of 21303012648 is 84621030312.

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, 231018 + ... + 309798.

It is an arithmetic number, because the mean of its divisors is an integer number (877434525).

Almost surely, 2^21303012648 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 21303012648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28077904800).

21303012648 is an abundant number, since it is smaller than the sum of its proper divisors (34852796952).

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

21303012648 is a wasteful number, since it uses less digits than its factorization.

21303012648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79402 (or 79398 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21303012648 in words is "twenty-one billion, three hundred three million, twelve thousand, six hundred forty-eight".