21512530324323 has 12 divisors (see below), whose sum is σ = 31075117685248. Its totient is φ = 14341011757200.

The previous prime is 21512530324319. The next prime is 21512530324331. The reversal of 21512530324323 is 32342303521512.

21512530324323 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 2 + 5 + 3 + 0 + 324 + 323 = 666.

It is not a de Polignac number, because 21512530324323 - 2² = 21512530324319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21512530324343) 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 11 ways as a sum of consecutive naturals, for example, 56058628 + ... + 56441073.

Almost surely, 2^{21512530324323} is an apocalyptic number.

21512530324323 is a deficient number, since it is larger than the sum of its proper divisors (9562587360925).

21512530324323 is a wasteful number, since it uses less digits than its factorization.

21512530324323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112520954 (or 112520951 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 21512530324323 its reverse (32342303521512), we get a palindrome (53854833845835).

The spelling of 21512530324323 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty million, three hundred twenty-four thousand, three hundred twenty-three".