8445021 has 16 divisors (see below), whose sum is σ = 12284160. Its totient is φ = 5129280.

The previous prime is 8445013. The next prime is 8445029. The reversal of 8445021 is 1205448.

It is an interprime number because it is at equal distance from previous prime (8445013) and next prime (8445029).

It is not a de Polignac number, because 8445021 - 2³ = 8445013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8444982 and 8445000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8445029) 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 15 ways as a sum of consecutive naturals, for example, 1711 + ... + 4451.

It is an arithmetic number, because the mean of its divisors is an integer number (767760).

Almost surely, 2^8445021 is an apocalyptic number.

It is an amenable number.

8445021 is a deficient number, since it is larger than the sum of its proper divisors (3839139).

8445021 is a wasteful number, since it uses less digits than its factorization.

8445021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836.

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

The square root of 8445021 is about 2906.0318305208. The cubic root of 8445021 is about 203.6417925692.

The spelling of 8445021 in words is "eight million, four hundred forty-five thousand, twenty-one".