11554504021521 has 48 divisors (see below), whose sum is σ = 16852009574400. Its totient is φ = 7628567078880.

The previous prime is 11554504021469. The next prime is 11554504021561. The reversal of 11554504021521 is 12512040545511.

11554504021521 is a `hidden beast` number, since 1 + 1 + 5 + 54 + 50 + 402 + 152 + 1 = 666.

It is not a de Polignac number, because 11554504021521 - 2⁹ = 11554504021009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11554504021561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 579831660 + ... + 579851586.

It is an arithmetic number, because the mean of its divisors is an integer number (351083532800).

Almost surely, 2^{11554504021521} is an apocalyptic number.

It is an amenable number.

11554504021521 is a deficient number, since it is larger than the sum of its proper divisors (5297505552879).

11554504021521 is a wasteful number, since it uses less digits than its factorization.

11554504021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21626 (or 21623 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The spelling of 11554504021521 in words is "eleven trillion, five hundred fifty-four billion, five hundred four million, twenty-one thousand, five hundred twenty-one".