21068497488 has 160 divisors (see below), whose sum is σ = 56407104000. Its totient is φ = 6772707328.

The previous prime is 21068497469. The next prime is 21068497501. The reversal of 21068497488 is 88479486012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78321418 + ... + 78321686.

It is an arithmetic number, because the mean of its divisors is an integer number (352544400).

Almost surely, 2^21068497488 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 21068497488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28203552000).

21068497488 is an abundant number, since it is smaller than the sum of its proper divisors (35338606512).

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

21068497488 is a wasteful number, since it uses less digits than its factorization.

21068497488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 57.

The spelling of 21068497488 in words is "twenty-one billion, sixty-eight million, four hundred ninety-seven thousand, four hundred eighty-eight".