2221066 has 4 divisors (see below), whose sum is σ = 3331602. Its totient is φ = 1110532.

The previous prime is 2221061. The next prime is 2221069. The reversal of 2221066 is 6601222.

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

It can be written as a sum of positive squares in only one way, i.e., 1635841 + 585225 = 1279^2 + 765^2 .

It is not an unprimeable number, because it can be changed into a prime (2221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555265 + ... + 555268.

2^2221066 is an apocalyptic number.

2221066 is a deficient number, since it is larger than the sum of its proper divisors (1110536).

2221066 is a wasteful number, since it uses less digits than its factorization.

2221066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110535.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2221066 is about 1490.3241258196. The cubic root of 2221066 is about 130.4729518278.

Subtracting from 2221066 its product of nonzero digits (288), we obtain a triangular number (2220778 = T₂₁₀₇).

Adding to 2221066 its reverse (6601222), we get a palindrome (8822288).

The spelling of 2221066 in words is "two million, two hundred twenty-one thousand, sixty-six".