8242521 has 16 divisors (see below), whose sum is σ = 12604800. Its totient is φ = 4693248.

The previous prime is 8242519. The next prime is 8242529. The reversal of 8242521 is 1252428.

It is not a de Polignac number, because 8242521 - 2¹ = 8242519 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8242491 and 8242500.

It is not an unprimeable number, because it can be changed into a prime (8242529) 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, 7665 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (787800).

Almost surely, 2^8242521 is an apocalyptic number.

It is an amenable number.

8242521 is a deficient number, since it is larger than the sum of its proper divisors (4362279).

8242521 is a wasteful number, since it uses less digits than its factorization.

8242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its digits is 1280, while the sum is 24.

The square root of 8242521 is about 2870.9791012823. The cubic root of 8242521 is about 202.0009231079. Note that the first 3 decimals are identical.

Adding to 8242521 its reverse (1252428), we get a palindrome (9494949).

The spelling of 8242521 in words is "eight million, two hundred forty-two thousand, five hundred twenty-one".