12042531521 has 8 divisors (see below), whose sum is σ = 12872611584. Its totient is φ = 11237992480.

The previous prime is 12042531517. The next prime is 12042531533. The reversal of 12042531521 is 12513524021.

12042531521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12042531521 - 2² = 12042531517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12042531551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6384281 + ... + 6386166.

It is an arithmetic number, because the mean of its divisors is an integer number (1609076448).

Almost surely, 2^12042531521 is an apocalyptic number.

It is an amenable number.

12042531521 is a deficient number, since it is larger than the sum of its proper divisors (830080063).

12042531521 is a wasteful number, since it uses less digits than its factorization.

12042531521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770511.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 12042531521 in words is "twelve billion, forty-two million, five hundred thirty-one thousand, five hundred twenty-one".