8221811 has 4 divisors (see below), whose sum is σ = 8854272. Its totient is φ = 7589352.

The previous prime is 8221793. The next prime is 8221823. The reversal of 8221811 is 1181228.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8221811 - 2⁶ = 8221747 is a prime.

It is a super-2 number, since 2×8221811² = 135196352239442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221831) 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, 316211 + ... + 316236.

It is an arithmetic number, because the mean of its divisors is an integer number (2213568).

Almost surely, 2^8221811 is an apocalyptic number.

8221811 is a deficient number, since it is larger than the sum of its proper divisors (632461).

8221811 is a wasteful number, since it uses less digits than its factorization.

8221811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632460.

The product of its digits is 256, while the sum is 23.

The square root of 8221811 is about 2867.3700493658. The cubic root of 8221811 is about 201.8316000024.

The spelling of 8221811 in words is "eight million, two hundred twenty-one thousand, eight hundred eleven".