12005140521 has 16 divisors (see below), whose sum is σ = 17464043520. Its totient is φ = 7275000720.

The previous prime is 12005140471. The next prime is 12005140561. The reversal of 12005140521 is 12504150021.

It is not a de Polignac number, because 12005140521 - 2¹⁸ = 12004878377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12005140561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385740 + ... + 415698.

It is an arithmetic number, because the mean of its divisors is an integer number (1091502720).

Almost surely, 2^12005140521 is an apocalyptic number.

12005140521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12005140521 is a deficient number, since it is larger than the sum of its proper divisors (5458902999).

12005140521 is a wasteful number, since it uses less digits than its factorization.

12005140521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42116.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 12005140521 its reverse (12504150021), we get a palindrome (24509290542).

The spelling of 12005140521 in words is "twelve billion, five million, one hundred forty thousand, five hundred twenty-one".