7066821 has 8 divisors (see below), whose sum is σ = 9435904. Its totient is φ = 4704480.

The previous prime is 7066799. The next prime is 7066837. The reversal of 7066821 is 1286607.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7066821 - 2¹⁰ = 7065797 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 (7066321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (1179488).

Almost surely, 2^7066821 is an apocalyptic number.

It is an amenable number.

7066821 is a deficient number, since it is larger than the sum of its proper divisors (2369083).

7066821 is a wasteful number, since it uses less digits than its factorization.

7066821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 7066821 is about 2658.3492998476. The cubic root of 7066821 is about 191.8998772683.

It can be divided in two parts, 7066 and 821, that added together give a palindrome (7887).

The spelling of 7066821 in words is "seven million, sixty-six thousand, eight hundred twenty-one".