12510001521 has 12 divisors (see below), whose sum is σ = 18085063620. Its totient is φ = 8333049600.

The previous prime is 12510001499. The next prime is 12510001571.

12510001521 is a `hidden beast` number, since 1 + 2 + 510 + 0 + 0 + 152 + 1 = 666.

12510001521 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 2462144400 + 10047857121 = 49620^2 + 100239^2 .

It is not a de Polignac number, because 12510001521 - 2¹⁸ = 12509739377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12510001494 and 12510001503.

It is not an unprimeable number, because it can be changed into a prime (12510001571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 567876 + ... + 589493.

It is an arithmetic number, because the mean of its divisors is an integer number (1507088635).

Almost surely, 2^12510001521 is an apocalyptic number.

It is an amenable number.

12510001521 is a deficient number, since it is larger than the sum of its proper divisors (5575062099).

12510001521 is a wasteful number, since it uses less digits than its factorization.

12510001521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158576 (or 1158573 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

It can be divided in two parts, 1251000 and 1521, that added together give a palindrome (1252521).

The spelling of 12510001521 in words is "twelve billion, five hundred ten million, one thousand, five hundred twenty-one".