21105750832 has 40 divisors (see below), whose sum is σ = 42280309760. Its totient is φ = 10195813440.

The previous prime is 21105750823. The next prime is 21105750833. The reversal of 21105750832 is 23805750112.

It is not an unprimeable number, because it can be changed into a prime (21105750833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272653 + ... + 341395.

It is an arithmetic number, because the mean of its divisors is an integer number (1057007744).

Almost surely, 2^21105750832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21105750832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21140154880).

21105750832 is an abundant number, since it is smaller than the sum of its proper divisors (21174558928).

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

21105750832 is a wasteful number, since it uses less digits than its factorization.

21105750832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69401 (or 69395 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 21105750832 in words is "twenty-one billion, one hundred five million, seven hundred fifty thousand, eight hundred thirty-two".