21512530324330 has 16 divisors (see below), whose sum is σ = 38745212633640. Its totient is φ = 8599977007552.

The previous prime is 21512530324319. The next prime is 21512530324331. The reversal of 21512530324330 is 3342303521512.

It can be written as a sum of positive squares in 4 ways, for example, as 11414606859601 + 10097923464729 = 3378551^2 + 3177723^2 .

It is not an unprimeable number, because it can be changed into a prime (21512530324331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629372329 + ... + 629406508.

Almost surely, 2^{21512530324330} is an apocalyptic number.

21512530324330 is a deficient number, since it is larger than the sum of its proper divisors (17232682309310).

21512530324330 is a wasteful number, since it uses less digits than its factorization.

21512530324330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258780553.

The product of its (nonzero) digits is 64800, while the sum is 34.

Adding to 21512530324330 its reverse (3342303521512), we get a palindrome (24854833845842).

The spelling of 21512530324330 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty million, three hundred twenty-four thousand, three hundred thirty".