12521530455 has 48 divisors (see below), whose sum is σ = 24322652160. Its totient is φ = 5387401728.

The previous prime is 12521530409. The next prime is 12521530459. The reversal of 12521530455 is 55403512521.

It is not a de Polignac number, because 12521530455 - 2¹⁰ = 12521529431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521530459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175975 + ... + 236664.

It is an arithmetic number, because the mean of its divisors is an integer number (506721920).

Almost surely, 2^12521530455 is an apocalyptic number.

12521530455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12521530455 is a deficient number, since it is larger than the sum of its proper divisors (11801121705).

12521530455 is a wasteful number, since it uses less digits than its factorization.

12521530455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412688 (or 412671 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 12521530455 in words is "twelve billion, five hundred twenty-one million, five hundred thirty thousand, four hundred fifty-five".