21650963520 has 224 divisors, whose sum is σ = 72222969600. Its totient is φ = 5484666880.

The previous prime is 21650963507. The next prime is 21650963527. The reversal of 21650963520 is 2536905612.

It is not an unprimeable number, because it can be changed into a prime (21650963527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3286630 + ... + 3293210.

Almost surely, 2^21650963520 is an apocalyptic number.

21650963520 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 21650963520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36111484800).

21650963520 is an abundant number, since it is smaller than the sum of its proper divisors (50572006080).

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

21650963520 is a wasteful number, since it uses less digits than its factorization.

21650963520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773 (or 6763 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 21650963520 in words is "twenty-one billion, six hundred fifty million, nine hundred sixty-three thousand, five hundred twenty".