8540512821 has 12 divisors (see below), whose sum is σ = 12337339872. Its totient is φ = 5693193576.

The previous prime is 8540512807. The next prime is 8540512859. The reversal of 8540512821 is 1282150458.

8540512821 is a `hidden beast` number, since 85 + 40 + 512 + 8 + 21 = 666.

It is not a de Polignac number, because 8540512821 - 2¹⁰ = 8540511797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8540512801) 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 11 ways as a sum of consecutive naturals, for example, 96730 + ... + 162596.

It is an arithmetic number, because the mean of its divisors is an integer number (1028111656).

Almost surely, 2^8540512821 is an apocalyptic number.

It is an amenable number.

8540512821 is a deficient number, since it is larger than the sum of its proper divisors (3796827051).

8540512821 is a wasteful number, since it uses less digits than its factorization.

8540512821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80280 (or 80277 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 8540512821 is about 92414.8950169831. The cubic root of 8540512821 is about 2044.0647537674.

The spelling of 8540512821 in words is "eight billion, five hundred forty million, five hundred twelve thousand, eight hundred twenty-one".