21530032132 has 24 divisors (see below), whose sum is σ = 43157290176. Its totient is φ = 9206322528.

The previous prime is 21530032087. The next prime is 21530032133. The reversal of 21530032132 is 23123003512.

It is not an unprimeable number, because it can be changed into a prime (21530032133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855463 + ... + 880270.

It is an arithmetic number, because the mean of its divisors is an integer number (1798220424).

Almost surely, 2^21530032132 is an apocalyptic number.

It is an amenable number.

21530032132 is an abundant number, since it is smaller than the sum of its proper divisors (21627258044).

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

21530032132 is a wasteful number, since it uses less digits than its factorization.

21530032132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736187 (or 1736185 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21530032132 its reverse (23123003512), we get a palindrome (44653035644).

The spelling of 21530032132 in words is "twenty-one billion, five hundred thirty million, thirty-two thousand, one hundred thirty-two".