8623220221 has 16 divisors (see below), whose sum is σ = 10760969088. Its totient is φ = 6713179200.

The previous prime is 8623220219. The next prime is 8623220251. The reversal of 8623220221 is 1220223268.

It is a happy number.

It is not a de Polignac number, because 8623220221 - 2¹ = 8623220219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8623220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8623220251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32931 + ... + 135391.

It is an arithmetic number, because the mean of its divisors is an integer number (672560568).

Almost surely, 2^8623220221 is an apocalyptic number.

It is an amenable number.

8623220221 is a deficient number, since it is larger than the sum of its proper divisors (2137748867).

8623220221 is a wasteful number, since it uses less digits than its factorization.

8623220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103572.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 8623220221 is about 92861.2956026352. The cubic root of 8623220221 is about 2050.6418946467.

Adding to 8623220221 its reverse (1220223268), we get a palindrome (9843443489).

The spelling of 8623220221 in words is "eight billion, six hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".