8512821 has 12 divisors (see below), whose sum is σ = 12324000. Its totient is φ = 5662440.

The previous prime is 8512799. The next prime is 8512831. The reversal of 8512821 is 1282158.

It is not a de Polignac number, because 8512821 - 2¹⁴ = 8496437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8512831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4930 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (1027000).

Almost surely, 2^8512821 is an apocalyptic number.

It is an amenable number.

8512821 is a deficient number, since it is larger than the sum of its proper divisors (3811179).

8512821 is a wasteful number, since it uses less digits than its factorization.

8512821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136 (or 2133 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 8512821 is about 2917.6739022722. The cubic root of 8512821 is about 204.1853131565.

Adding to 8512821 its reverse (1282158), we get a palindrome (9794979).

The spelling of 8512821 in words is "eight million, five hundred twelve thousand, eight hundred twenty-one".