21532131232 has 24 divisors (see below), whose sum is σ = 42454042596. Its totient is φ = 10750152192.

The previous prime is 21532131227. The next prime is 21532131239. The reversal of 21532131232 is 23213123512.

It can be written as a sum of positive squares in 2 ways, for example, as 21373270416 + 158860816 = 146196^2 + 12604^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21532131197 and 21532131206.

It is not an unprimeable number, because it can be changed into a prime (21532131239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475293 + ... + 518620.

Almost surely, 2^21532131232 is an apocalyptic number.

It is an amenable number.

21532131232 is a deficient number, since it is larger than the sum of its proper divisors (20921911364).

21532131232 is an equidigital number, since it uses as much as digits as its factorization.

21532131232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994600 (or 994592 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

Adding to 21532131232 its reverse (23213123512), we get a palindrome (44745254744).

The spelling of 21532131232 in words is "twenty-one billion, five hundred thirty-two million, one hundred thirty-one thousand, two hundred thirty-two".