21030240132 has 144 divisors (see below), whose sum is σ = 59313159360. Its totient is φ = 6228921600.

The previous prime is 21030240131. The next prime is 21030240151. The reversal of 21030240132 is 23104203012.

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

It is not an unprimeable number, because it can be changed into a prime (21030240131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4226398 + ... + 4231370.

It is an arithmetic number, because the mean of its divisors is an integer number (411896940).

Almost surely, 2^21030240132 is an apocalyptic number.

21030240132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030240132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29656579680).

21030240132 is an abundant number, since it is smaller than the sum of its proper divisors (38282919228).

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

21030240132 is a wasteful number, since it uses less digits than its factorization.

21030240132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234 (or 5229 counting only the distinct ones).

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

Adding to 21030240132 its reverse (23104203012), we get a palindrome (44134443144).

It can be divided in two parts, 21030 and 240132, that added together give a palindrome (261162).

The spelling of 21030240132 in words is "twenty-one billion, thirty million, two hundred forty thousand, one hundred thirty-two".