21093799680 has 432 divisors, whose sum is σ = 76804771680. Its totient is φ = 5541986304.

The previous prime is 21093799673. The next prime is 21093799691. The reversal of 21093799680 is 8699739012.

21093799680 is a `hidden beast` number, since 2 + 109 + 379 + 96 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22705456 + ... + 22706384.

Almost surely, 2^21093799680 is an apocalyptic number.

21093799680 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 21093799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38402385840).

21093799680 is an abundant number, since it is smaller than the sum of its proper divisors (55710972000).

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

21093799680 is an frugal number, since it uses more digits than its factorization.

21093799680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 21093799680 in words is "twenty-one billion, ninety-three million, seven hundred ninety-nine thousand, six hundred eighty".