12315505085521 has 4 divisors (see below), whose sum is σ = 13435096456944. Its totient is φ = 11195913714100.

The previous prime is 12315505085491. The next prime is 12315505085651. The reversal of 12315505085521 is 12558050551321.

12315505085521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12315505085521 - 2¹¹ = 12315505083473 is a prime.

It is a super-2 number, since 2×12315505085521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315505025521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559795685695 + ... + 559795685716.

It is an arithmetic number, because the mean of its divisors is an integer number (3358774114236).

Almost surely, 2^{12315505085521} is an apocalyptic number.

12315505085521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12315505085521 is a deficient number, since it is larger than the sum of its proper divisors (1119591371423).

12315505085521 is a wasteful number, since it uses less digits than its factorization.

12315505085521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119591371422.

The product of its (nonzero) digits is 300000, while the sum is 43.

The spelling of 12315505085521 in words is "twelve trillion, three hundred fifteen billion, five hundred five million, eighty-five thousand, five hundred twenty-one".