21530230352 has 20 divisors (see below), whose sum is σ = 41728814676. Its totient is φ = 10761504000.

The previous prime is 21530230313. The next prime is 21530230367. The reversal of 21530230352 is 25303203512.

It can be written as a sum of positive squares in 2 ways, for example, as 10552220176 + 10978010176 = 102724^2 + 104776^2 .

It is a congruent number.

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, 176183 + ... + 272214.

Almost surely, 2^21530230352 is an apocalyptic number.

It is an amenable number.

21530230352 is a deficient number, since it is larger than the sum of its proper divisors (20198584324).

21530230352 is a wasteful number, since it uses less digits than its factorization.

21530230352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451406 (or 451400 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21530230352 its reverse (25303203512), we get a palindrome (46833433864).

The spelling of 21530230352 in words is "twenty-one billion, five hundred thirty million, two hundred thirty thousand, three hundred fifty-two".