12040520521421 has 16 divisors (see below), whose sum is σ = 13830689978880. Its totient is φ = 10267937181360.

The previous prime is 12040520521417. The next prime is 12040520521423. The reversal of 12040520521421 is 12412502504021.

It is a cyclic number.

It is not a de Polignac number, because 12040520521421 - 2² = 12040520521417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12040520521423) 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, 278435 + ... + 4915136.

It is an arithmetic number, because the mean of its divisors is an integer number (864418123680).

Almost surely, 2^{12040520521421} is an apocalyptic number.

It is an amenable number.

12040520521421 is a deficient number, since it is larger than the sum of its proper divisors (1790169457459).

12040520521421 is a wasteful number, since it uses less digits than its factorization.

12040520521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195264.

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 12040520521421 in words is "twelve trillion, forty billion, five hundred twenty million, five hundred twenty-one thousand, four hundred twenty-one".