21660760000 has 280 divisors, whose sum is σ = 61702248960. Its totient is φ = 7459200000.

The previous prime is 21660759997. The next prime is 21660760013. The reversal of 21660760000 is 6706612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8358705 + ... + 8361295.

Almost surely, 2^21660760000 is an apocalyptic number.

21660760000 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 21660760000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30851124480).

21660760000 is an abundant number, since it is smaller than the sum of its proper divisors (40041488960).

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

21660760000 is a wasteful number, since it uses less digits than its factorization.

21660760000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653 (or 2628 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The spelling of 21660760000 in words is "twenty-one billion, six hundred sixty million, seven hundred sixty thousand".