2221745 has 4 divisors (see below), whose sum is σ = 2666100. Its totient is φ = 1777392.

The previous prime is 2221741. The next prime is 2221753. The reversal of 2221745 is 5471222.

It is a happy number.

2221745 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: 5471222 = 2 ⋅2735611.

It can be written as a sum of positive squares in 2 ways, for example, as 703921 + 1517824 = 839^2 + 1232^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221745 - 2² = 2221741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2221745.

It is not an unprimeable number, because it can be changed into a prime (2221741) by changing a digit.

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, 222170 + ... + 222179.

It is an arithmetic number, because the mean of its divisors is an integer number (666525).

2^2221745 is an apocalyptic number.

It is an amenable number.

2221745 is a deficient number, since it is larger than the sum of its proper divisors (444355).

2221745 is an equidigital number, since it uses as much as digits as its factorization.

2221745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444354.

The product of its digits is 1120, while the sum is 23.

The square root of 2221745 is about 1490.5519112060. The cubic root of 2221745 is about 130.4862460610.

Adding to 2221745 its reverse (5471222), we get a palindrome (7692967).

The spelling of 2221745 in words is "two million, two hundred twenty-one thousand, seven hundred forty-five".