2110221 has 12 divisors (see below), whose sum is σ = 3130972. Its totient is φ = 1368576.

The previous prime is 2110217. The next prime is 2110223. The reversal of 2110221 is 1220112.

It can be written as a sum of positive squares in 2 ways, for example, as 1368900 + 741321 = 1170^2 + 861^2 .

It is not a de Polignac number, because 2110221 - 2² = 2110217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2836 + ... + 3501.

2^2110221 is an apocalyptic number.

It is an amenable number.

2110221 is a deficient number, since it is larger than the sum of its proper divisors (1020751).

2110221 is a wasteful number, since it uses less digits than its factorization.

2110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6380 (or 6377 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2110221 is about 1452.6599739788. The cubic root of 2110221 is about 128.2653390679.

Adding to 2110221 its reverse (1220112), we get a palindrome (3330333).

The spelling of 2110221 in words is "two million, one hundred ten thousand, two hundred twenty-one".