21105832044 has 96 divisors (see below), whose sum is σ = 57355022592. Its totient is φ = 6019411200.

The previous prime is 21105832043. The next prime is 21105832063. The reversal of 21105832044 is 44023850112.

It is a super-2 number, since 2×21105832044² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21105832043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232659 + ... + 310389.

It is an arithmetic number, because the mean of its divisors is an integer number (597448152).

Almost surely, 2^21105832044 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 21105832044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28677511296).

21105832044 is an abundant number, since it is smaller than the sum of its proper divisors (36249190548).

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

21105832044 is a wasteful number, since it uses less digits than its factorization.

21105832044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77788 (or 77764 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 21105832044 in words is "twenty-one billion, one hundred five million, eight hundred thirty-two thousand, forty-four".