8168021 has 4 divisors (see below), whose sum is σ = 8206944. Its totient is φ = 8129100.

The previous prime is 8168011. The next prime is 8168023. The reversal of 8168021 is 1208618.

8168021 = T₁₆₆ + T₁₆₇ + ... + T₃₇₆.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1208618 = 2 ⋅604309.

It is a cyclic number.

It is not a de Polignac number, because 8168021 - 2¹⁰ = 8166997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8168023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19145 + ... + 19566.

It is an arithmetic number, because the mean of its divisors is an integer number (2051736).

Almost surely, 2^8168021 is an apocalyptic number.

It is an amenable number.

8168021 is a deficient number, since it is larger than the sum of its proper divisors (38923).

8168021 is a wasteful number, since it uses less digits than its factorization.

8168021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38922.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 8168021 is about 2857.9749823958. The cubic root of 8168021 is about 201.3904853489.

The spelling of 8168021 in words is "eight million, one hundred sixty-eight thousand, twenty-one".