2211145 has 4 divisors (see below), whose sum is σ = 2653380. Its totient is φ = 1768912.

The previous prime is 2211127. The next prime is 2211161. The reversal of 2211145 is 5411122.

2211145 is digitally balanced in base 2, 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 an emirpimes, since its reverse is a distinct semiprime: 5411122 = 2 ⋅2705561.

It can be written as a sum of positive squares in 2 ways, for example, as 1763584 + 447561 = 1328^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211145 - 2⁹ = 2210633 is a prime.

It is a super-2 number, since 2×2211145² = 9778324422050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221110 + ... + 221119.

It is an arithmetic number, because the mean of its divisors is an integer number (663345).

2^2211145 is an apocalyptic number.

It is an amenable number.

2211145 is a deficient number, since it is larger than the sum of its proper divisors (442235).

2211145 is an equidigital number, since it uses as much as digits as its factorization.

2211145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442234.

The product of its digits is 80, while the sum is 16.

The square root of 2211145 is about 1486.9919300386. The cubic root of 2211145 is about 130.2783974638.

Adding to 2211145 its reverse (5411122), we get a palindrome (7622267).

The spelling of 2211145 in words is "two million, two hundred eleven thousand, one hundred forty-five".