21232100232 has 144 divisors (see below), whose sum is σ = 67155096060. Its totient is φ = 6042451968.

The previous prime is 21232100189. The next prime is 21232100243. The reversal of 21232100232 is 23200123212.

It can be written as a sum of positive squares in 2 ways, for example, as 19478668356 + 1753431876 = 139566^2 + 41874^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 894988 + ... + 918404.

Almost surely, 2^21232100232 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 21232100232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33577548030).

21232100232 is an abundant number, since it is smaller than the sum of its proper divisors (45922995828).

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

21232100232 is a wasteful number, since it uses less digits than its factorization.

21232100232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23700 (or 23686 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21232100232 its reverse (23200123212), we get a palindrome (44432223444).

The spelling of 21232100232 in words is "twenty-one billion, two hundred thirty-two million, one hundred thousand, two hundred thirty-two".