21068489232 has 480 divisors, whose sum is σ = 75235184640. Its totient is φ = 5608673280.

The previous prime is 21068489219. The next prime is 21068489237. The reversal of 21068489232 is 23298486012.

It is not an unprimeable number, because it can be changed into a prime (21068489237) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45701482 + ... + 45701942.

It is an arithmetic number, because the mean of its divisors is an integer number (156739968).

Almost surely, 2^21068489232 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 21068489232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37617592320).

21068489232 is an abundant number, since it is smaller than the sum of its proper divisors (54166695408).

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

21068489232 is a wasteful number, since it uses less digits than its factorization.

21068489232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21068489232 in words is "twenty-one billion, sixty-eight million, four hundred eighty-nine thousand, two hundred thirty-two".