8121021 has 4 divisors (see below), whose sum is σ = 10828032. Its totient is φ = 5414012.

The previous prime is 8121013. The next prime is 8121049. The reversal of 8121021 is 1201218.

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 8121021 - 2³ = 8121013 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353501 + ... + 1353506.

It is an arithmetic number, because the mean of its divisors is an integer number (2707008).

Almost surely, 2^8121021 is an apocalyptic number.

It is an amenable number.

8121021 is a deficient number, since it is larger than the sum of its proper divisors (2707011).

8121021 is a wasteful number, since it uses less digits than its factorization.

8121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707010.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 8121021 is about 2849.7405145030. The cubic root of 8121021 is about 201.0034652010.

Adding to 8121021 its reverse (1201218), we get a palindrome (9322239).

The spelling of 8121021 in words is "eight million, one hundred twenty-one thousand, twenty-one".