21012324032 has 112 divisors (see below), whose sum is σ = 48807014400. Its totient is φ = 8788995072.

The previous prime is 21012324031. The next prime is 21012324083. The reversal of 21012324032 is 23042321012.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×21012324032² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012323995 and 21012324013.

It is not an unprimeable number, because it can be changed into a prime (21012324031) 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 15 ways as a sum of consecutive naturals, for example, 4722833 + ... + 4727279.

Almost surely, 2^21012324032 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 21012324032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24403507200).

21012324032 is an abundant number, since it is smaller than the sum of its proper divisors (27794690368).

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

21012324032 is a wasteful number, since it uses less digits than its factorization.

21012324032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21012324032 its reverse (23042321012), we get a palindrome (44054645044).

The spelling of 21012324032 in words is "twenty-one billion, twelve million, three hundred twenty-four thousand, thirty-two".