8366021 has 4 divisors (see below), whose sum is σ = 8472000. Its totient is φ = 8260044.

The previous prime is 8366003. The next prime is 8366069. The reversal of 8366021 is 1206638.

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: 1206638 = 2 ⋅603319.

It is a cyclic number.

It is not a de Polignac number, because 8366021 - 2⁶ = 8365957 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 (8366321) 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, 52871 + ... + 53028.

It is an arithmetic number, because the mean of its divisors is an integer number (2118000).

Almost surely, 2^8366021 is an apocalyptic number.

It is an amenable number.

8366021 is a deficient number, since it is larger than the sum of its proper divisors (105979).

8366021 is a wasteful number, since it uses less digits than its factorization.

8366021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105978.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 8366021 is about 2892.4074747518. The cubic root of 8366021 is about 203.0048046619.

The spelling of 8366021 in words is "eight million, three hundred sixty-six thousand, twenty-one".