2210221 has 16 divisors (see below), whose sum is σ = 2573424. Its totient is φ = 1880064.

The previous prime is 2210209. The next prime is 2210227. The reversal of 2210221 is 1220122.

It can be written as a sum of positive squares in 8 ways, for example, as 2025 + 2208196 = 45^2 + 1486^2 .

It is not a de Polignac number, because 2210221 - 2⁵ = 2210189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210198 and 2210207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210227) 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, 16065 + ... + 16201.

It is an arithmetic number, because the mean of its divisors is an integer number (160839).

2^2210221 is an apocalyptic number.

It is an amenable number.

2210221 is a deficient number, since it is larger than the sum of its proper divisors (363203).

2210221 is a wasteful number, since it uses less digits than its factorization.

2210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2210221 is about 1486.6812032174. The cubic root of 2210221 is about 130.2602478911.

Adding to 2210221 its reverse (1220122), we get a palindrome (3430343).

Subtracting from 2210221 its reverse (1220122), we obtain a palindrome (990099).

The spelling of 2210221 in words is "two million, two hundred ten thousand, two hundred twenty-one".