11554536321521 has 16 divisors (see below), whose sum is σ = 11969724965760. Its totient is φ = 11140467381120.

The previous prime is 11554536321509. The next prime is 11554536321541. The reversal of 11554536321521 is 12512363545511.

It is a cyclic number.

It is not a de Polignac number, because 11554536321521 - 2²² = 11554532127217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11554536321541) 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, 466592486 + ... + 466617248.

It is an arithmetic number, because the mean of its divisors is an integer number (748107810360).

Almost surely, 2^{11554536321521} is an apocalyptic number.

It is an amenable number.

11554536321521 is a deficient number, since it is larger than the sum of its proper divisors (415188644239).

11554536321521 is a wasteful number, since it uses less digits than its factorization.

11554536321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46696.

The product of its digits is 540000, while the sum is 44.

The spelling of 11554536321521 in words is "eleven trillion, five hundred fifty-four billion, five hundred thirty-six million, three hundred twenty-one thousand, five hundred twenty-one".