21683613355950 has 480 divisors, whose sum is σ = 68009529111552. Its totient is φ = 4544557920000.

The previous prime is 21683613355913. The next prime is 21683613355961. The reversal of 21683613355950 is 5955331638612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 706959115 + ... + 706989785.

Almost surely, 2^{21683613355950} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21683613355950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34004764555776).

21683613355950 is an abundant number, since it is smaller than the sum of its proper divisors (46325915755602).

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

21683613355950 is a wasteful number, since it uses less digits than its factorization.

21683613355950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30878 (or 30852 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 57.

The spelling of 21683613355950 in words is "twenty-one trillion, six hundred eighty-three billion, six hundred thirteen million, three hundred fifty-five thousand, nine hundred fifty".