21448231680 has 144 divisors (see below), whose sum is σ = 69107885280. Its totient is φ = 5668798464.

The previous prime is 21448231661. The next prime is 21448231691. The reversal of 21448231680 is 8613284412.

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, 409206 + ... + 458634.

It is an arithmetic number, because the mean of its divisors is an integer number (479915870).

Almost surely, 2^21448231680 is an apocalyptic number.

21448231680 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 21448231680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34553942640).

21448231680 is an abundant number, since it is smaller than the sum of its proper divisors (47659653600).

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

21448231680 is a wasteful number, since it uses less digits than its factorization.

21448231680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49566 (or 49552 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 21448231680 in words is "twenty-one billion, four hundred forty-eight million, two hundred thirty-one thousand, six hundred eighty".