2209121 has 4 divisors (see below), whose sum is σ = 2263044. Its totient is φ = 2155200.

The previous prime is 2209117. The next prime is 2209169. The reversal of 2209121 is 1219022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 1661521 = 740^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209121 - 2² = 2209117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2209121.

It is not an unprimeable number, because it can be changed into a prime (2209171) 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, 26900 + ... + 26981.

It is an arithmetic number, because the mean of its divisors is an integer number (565761).

2^2209121 is an apocalyptic number.

It is an amenable number.

2209121 is a deficient number, since it is larger than the sum of its proper divisors (53923).

2209121 is an equidigital number, since it uses as much as digits as its factorization.

2209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53922.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2209121 is about 1486.3112056363. The cubic root of 2209121 is about 130.2386346603.

Subtracting from 2209121 its reverse (1219022), we obtain a palindrome (990099).

It can be divided in two parts, 2209 and 121, that multiplied together give a square (267289 = 517²).

The spelling of 2209121 in words is "two million, two hundred nine thousand, one hundred twenty-one".