21530224132 has 48 divisors (see below), whose sum is σ = 38638156032. Its totient is φ = 10493683200.

The previous prime is 21530224117. The next prime is 21530224189. The reversal of 21530224132 is 23142203512.

It is a junction number, because it is equal to n+sod(n) for n = 21530224097 and 21530224106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39360283 + ... + 39360829.

It is an arithmetic number, because the mean of its divisors is an integer number (804961584).

Almost surely, 2^21530224132 is an apocalyptic number.

It is an amenable number.

21530224132 is a deficient number, since it is larger than the sum of its proper divisors (17107931900).

21530224132 is a wasteful number, since it uses less digits than its factorization.

21530224132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21530224132 its reverse (23142203512), we get a palindrome (44672427644).

The spelling of 21530224132 in words is "twenty-one billion, five hundred thirty million, two hundred twenty-four thousand, one hundred thirty-two".