8144021 has 4 divisors (see below), whose sum is σ = 8186412. Its totient is φ = 8101632.

The previous prime is 8144011. The next prime is 8144029. The reversal of 8144021 is 1204418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 6832996 = 1145^2 + 2614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8144021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8143984 and 8144002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8144029) 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, 20906 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (2046603).

Almost surely, 2^8144021 is an apocalyptic number.

It is an amenable number.

8144021 is a deficient number, since it is larger than the sum of its proper divisors (42391).

8144021 is a wasteful number, since it uses less digits than its factorization.

8144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42390.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 8144021 is about 2853.7731164197. The cubic root of 8144021 is about 201.1930440781.

Adding to 8144021 its reverse (1204418), we get a palindrome (9348439).

The spelling of 8144021 in words is "eight million, one hundred forty-four thousand, twenty-one".