21530332132 has 24 divisors (see below), whose sum is σ = 38799194112. Its totient is φ = 10447598400.

The previous prime is 21530332129. The next prime is 21530332171. The reversal of 21530332132 is 23123303512.

It is a junction number, because it is equal to n+sod(n) for n = 21530332097 and 21530332106.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 312348 + ... + 374995.

It is an arithmetic number, because the mean of its divisors is an integer number (1616633088).

Almost surely, 2^21530332132 is an apocalyptic number.

It is an amenable number.

21530332132 is a deficient number, since it is larger than the sum of its proper divisors (17268861980).

21530332132 is a wasteful number, since it uses less digits than its factorization.

21530332132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687579 (or 687577 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 21530332132 its reverse (23123303512), we get a palindrome (44653635644).

The spelling of 21530332132 in words is "twenty-one billion, five hundred thirty million, three hundred thirty-two thousand, one hundred thirty-two".