21708763930560 has 896 divisors, whose sum is σ = 80511875389440. Its totient is φ = 4853994356736.

The previous prime is 21708763930523. The next prime is 21708763930591. The reversal of 21708763930560 is 6503936780712.

It is a self number, because there is not a number n which added to its sum of digits gives 21708763930560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 22779395044 + ... + 22779395996.

Almost surely, 2^{21708763930560} is an apocalyptic number.

21708763930560 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 21708763930560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40255937694720).

21708763930560 is an abundant number, since it is smaller than the sum of its proper divisors (58803111458880).

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

21708763930560 is a wasteful number, since it uses less digits than its factorization.

21708763930560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 21708763930560 in words is "twenty-one trillion, seven hundred eight billion, seven hundred sixty-three million, nine hundred thirty thousand, five hundred sixty".