21680421714 has 192 divisors, whose sum is σ = 56996352000. Its totient is φ = 6090287616.

The previous prime is 21680421683. The next prime is 21680421727. The reversal of 21680421714 is 41712408612.

It is a happy number.

21680421714 is a `hidden beast` number, since 2 + 168 + 0 + 421 + 71 + 4 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 50070042 + ... + 50070474.

It is an arithmetic number, because the mean of its divisors is an integer number (296856000).

Almost surely, 2^21680421714 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21680421714, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28498176000).

21680421714 is an abundant number, since it is smaller than the sum of its proper divisors (35315930286).

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

21680421714 is a wasteful number, since it uses less digits than its factorization.

21680421714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 21680421714 in words is "twenty-one billion, six hundred eighty million, four hundred twenty-one thousand, seven hundred fourteen".