21243004232 has 16 divisors (see below), whose sum is σ = 39841479600. Its totient is φ = 10618609680.

The previous prime is 21243004219. The next prime is 21243004241. The reversal of 21243004232 is 23240034212.

It is a junction number, because it is equal to n+sod(n) for n = 21243004198 and 21243004207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330182 + ... + 389237.

It is an arithmetic number, because the mean of its divisors is an integer number (2490092475).

Almost surely, 2^21243004232 is an apocalyptic number.

It is an amenable number.

21243004232 is a deficient number, since it is larger than the sum of its proper divisors (18598475368).

21243004232 is a wasteful number, since it uses less digits than its factorization.

21243004232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723116 (or 723112 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21243004232 its reverse (23240034212), we get a palindrome (44483038444).

The spelling of 21243004232 in words is "twenty-one billion, two hundred forty-three million, four thousand, two hundred thirty-two".