21596248464 has 160 divisors (see below), whose sum is σ = 67189985280. Its totient is φ = 5839174656.

The previous prime is 21596248417. The next prime is 21596248481. The reversal of 21596248464 is 46484269512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10104804 + ... + 10106940.

It is an arithmetic number, because the mean of its divisors is an integer number (419937408).

Almost surely, 2^21596248464 is an apocalyptic number.

21596248464 is a gapful number since it is divisible by the number (24) 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 21596248464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33594992640).

21596248464 is an abundant number, since it is smaller than the sum of its proper divisors (45593736816).

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

21596248464 is a wasteful number, since it uses less digits than its factorization.

21596248464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757 (or 3751 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The spelling of 21596248464 in words is "twenty-one billion, five hundred ninety-six million, two hundred forty-eight thousand, four hundred sixty-four".