12521430561 has 32 divisors (see below), whose sum is σ = 17105437440. Its totient is φ = 8145690624.

The previous prime is 12521430539. The next prime is 12521430589. The reversal of 12521430561 is 16503412521.

It is not a de Polignac number, because 12521430561 - 2¹⁰ = 12521429537 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12521530561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8061961 + ... + 8063513.

It is an arithmetic number, because the mean of its divisors is an integer number (534544920).

Almost surely, 2^12521430561 is an apocalyptic number.

It is an amenable number.

12521430561 is a deficient number, since it is larger than the sum of its proper divisors (4584006879).

12521430561 is a wasteful number, since it uses less digits than its factorization.

12521430561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 12521430561 in words is "twelve billion, five hundred twenty-one million, four hundred thirty thousand, five hundred sixty-one".