8820521 has 4 divisors (see below), whose sum is σ = 8836752. Its totient is φ = 8804292.

The previous prime is 8820509. The next prime is 8820529. The reversal of 8820521 is 1250288.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8820521 - 2²² = 4626217 is a prime.

It is a super-2 number, since 2×8820521² = 155603181422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8820529) 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 3 ways as a sum of consecutive naturals, for example, 7271 + ... + 8396.

It is an arithmetic number, because the mean of its divisors is an integer number (2209188).

Almost surely, 2^8820521 is an apocalyptic number.

It is an amenable number.

8820521 is a deficient number, since it is larger than the sum of its proper divisors (16231).

8820521 is a wasteful number, since it uses less digits than its factorization.

8820521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16230.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 8820521 is about 2969.9361946008. The cubic root of 8820521 is about 206.6163789659.

The spelling of 8820521 in words is "eight million, eight hundred twenty thousand, five hundred twenty-one".