8100221 has 4 divisors (see below), whose sum is σ = 8176032. Its totient is φ = 8024412.

The previous prime is 8100217. The next prime is 8100227. The reversal of 8100221 is 1220018.

8100221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 8100221 - 2² = 8100217 is a prime.

It is a super-2 number, since 2×8100221² = 131227160497682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8100196 and 8100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8100227) 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, 37745 + ... + 37958.

It is an arithmetic number, because the mean of its divisors is an integer number (2044008).

Almost surely, 2^8100221 is an apocalyptic number.

It is an amenable number.

8100221 is a deficient number, since it is larger than the sum of its proper divisors (75811).

8100221 is a wasteful number, since it uses less digits than its factorization.

8100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75810.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 8100221 is about 2846.0887196291. The cubic root of 8100221 is about 200.8317114856.

Adding to 8100221 its reverse (1220018), we get a palindrome (9320239).

The spelling of 8100221 in words is "eight million, one hundred thousand, two hundred twenty-one".