12547474521 has 32 divisors (see below), whose sum is σ = 17722188288. Its totient is φ = 7886534400.

The previous prime is 12547474507. The next prime is 12547474531.

12547474521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12547474521 - 2¹¹ = 12547472473 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 (12547474531) 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, 515011 + ... + 538823.

It is an arithmetic number, because the mean of its divisors is an integer number (553818384).

Almost surely, 2^12547474521 is an apocalyptic number.

It is an amenable number.

12547474521 is a deficient number, since it is larger than the sum of its proper divisors (5174713767).

12547474521 is a wasteful number, since it uses less digits than its factorization.

12547474521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24001.

The product of its digits is 313600, while the sum is 42.

The spelling of 12547474521 in words is "twelve billion, five hundred forty-seven million, four hundred seventy-four thousand, five hundred twenty-one".