21299066880 has 768 divisors, whose sum is σ = 88499174400. Its totient is φ = 4246732800.

The previous prime is 21299066869. The next prime is 21299066903. The reversal of 21299066880 is 8866099212.

It is a tau number, because it is divible by the number of its divisors (768).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53114680 + ... + 53115080.

It is an arithmetic number, because the mean of its divisors is an integer number (115233300).

Almost surely, 2^21299066880 is an apocalyptic number.

21299066880 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 21299066880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44249587200).

21299066880 is an abundant number, since it is smaller than the sum of its proper divisors (67200107520).

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

21299066880 is a wasteful number, since it uses less digits than its factorization.

21299066880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 21299066880 in words is "twenty-one billion, two hundred ninety-nine million, sixty-six thousand, eight hundred eighty".