21300516323524 has 6 divisors (see below), whose sum is σ = 37275903566174. Its totient is φ = 10650258161760.

The previous prime is 21300516323503. The next prime is 21300516323609. The reversal of 21300516323524 is 42532361500312.

It can be written as a sum of positive squares in only one way, i.e., 19275331175424 + 2025185148100 = 4390368^2 + 1423090^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2662564540437 + ... + 2662564540444.

Almost surely, 2^{21300516323524} is an apocalyptic number.

It is an amenable number.

21300516323524 is a deficient number, since it is larger than the sum of its proper divisors (15975387242650).

21300516323524 is a wasteful number, since it uses less digits than its factorization.

21300516323524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325129080885 (or 5325129080883 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 21300516323524 its reverse (42532361500312), we get a palindrome (63832877823836).

The spelling of 21300516323524 in words is "twenty-one trillion, three hundred billion, five hundred sixteen million, three hundred twenty-three thousand, five hundred twenty-four".