21032321232 has 40 divisors (see below), whose sum is σ = 58512997984. Its totient is φ = 6471483264.

The previous prime is 21032321213. The next prime is 21032321249. The reversal of 21032321232 is 23212323012.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21032321199 and 21032321208.

It is a congruent number.

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, 16852198 + ... + 16853445.

Almost surely, 2^21032321232 is an apocalyptic number.

It is an amenable number.

21032321232 is an abundant number, since it is smaller than the sum of its proper divisors (37480676752).

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

21032321232 is a wasteful number, since it uses less digits than its factorization.

21032321232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33705667 (or 33705661 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21032321232 its reverse (23212323012), we get a palindrome (44244644244).

The spelling of 21032321232 in words is "twenty-one billion, thirty-two million, three hundred twenty-one thousand, two hundred thirty-two".