21589453950 has 96 divisors (see below), whose sum is σ = 56516144640. Its totient is φ = 5439052800.

The previous prime is 21589453939. The next prime is 21589453967. The reversal of 21589453950 is 5935498512.

It is a happy number.

It is a super-2 number, since 2×21589453950² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21589453893 and 21589453902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1035630 + ... + 1056270.

It is an arithmetic number, because the mean of its divisors is an integer number (588709840).

Almost surely, 2^21589453950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21589453950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28258072320).

21589453950 is an abundant number, since it is smaller than the sum of its proper divisors (34926690690).

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

21589453950 is a wasteful number, since it uses less digits than its factorization.

21589453950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21042 (or 21037 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 21589453950 in words is "twenty-one billion, five hundred eighty-nine million, four hundred fifty-three thousand, nine hundred fifty".