12105052521 has 8 divisors (see below), whose sum is σ = 17089485984. Its totient is φ = 7595327040.

The previous prime is 12105052493. The next prime is 12105052529. The reversal of 12105052521 is 12525050121.

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

It is not a de Polignac number, because 12105052521 - 2⁹ = 12105052009 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12105052491 and 12105052500.

It is not an unprimeable number, because it can be changed into a prime (12105052529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118676935 + ... + 118677036.

It is an arithmetic number, because the mean of its divisors is an integer number (2136185748).

Almost surely, 2^12105052521 is an apocalyptic number.

It is an amenable number.

12105052521 is a deficient number, since it is larger than the sum of its proper divisors (4984433463).

12105052521 is a wasteful number, since it uses less digits than its factorization.

12105052521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237353991.

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 12105052521 in words is "twelve billion, one hundred five million, fifty-two thousand, five hundred twenty-one".