21788448330 has 64 divisors (see below), whose sum is σ = 57182630400. Its totient is φ = 5269408320.

The previous prime is 21788448313. The next prime is 21788448337. The reversal of 21788448330 is 3384488712.

It is a self number, because there is not a number n which added to its sum of digits gives 21788448330.

It is not an unprimeable number, because it can be changed into a prime (21788448337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59481 + ... + 217059.

It is an arithmetic number, because the mean of its divisors is an integer number (893478600).

Almost surely, 2^21788448330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21788448330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28591315200).

21788448330 is an abundant number, since it is smaller than the sum of its proper divisors (35394182070).

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

21788448330 is a wasteful number, since it uses less digits than its factorization.

21788448330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158019.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 21788448330 in words is "twenty-one billion, seven hundred eighty-eight million, four hundred forty-eight thousand, three hundred thirty".