2221045 has 4 divisors (see below), whose sum is σ = 2665260. Its totient is φ = 1776832.

The previous prime is 2221031. The next prime is 2221061. The reversal of 2221045 is 5401222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5401222 = 2 ⋅2700611.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 935089 = 1134^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221045 - 2⁷ = 2220917 is a prime.

2221045 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222100 + ... + 222109.

It is an arithmetic number, because the mean of its divisors is an integer number (666315).

2^2221045 is an apocalyptic number.

It is an amenable number.

2221045 is a deficient number, since it is larger than the sum of its proper divisors (444215).

2221045 is an equidigital number, since it uses as much as digits as its factorization.

2221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444214.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2221045 is about 1490.3170803557. The cubic root of 2221045 is about 130.4725406228.

Adding to 2221045 its reverse (5401222), we get a palindrome (7622267).

The spelling of 2221045 in words is "two million, two hundred twenty-one thousand, forty-five".