2847221 has 4 divisors (see below), whose sum is σ = 3066252. Its totient is φ = 2628192.

The previous prime is 2847217. The next prime is 2847227. The reversal of 2847221 is 1227482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1227482 = 2 ⋅613741.

It can be written as a sum of positive squares in 2 ways, for example, as 1612900 + 1234321 = 1270^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2847221 - 2² = 2847217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2847227) 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, 109496 + ... + 109521.

It is an arithmetic number, because the mean of its divisors is an integer number (766563).

2^2847221 is an apocalyptic number.

It is an amenable number.

2847221 is a deficient number, since it is larger than the sum of its proper divisors (219031).

2847221 is a wasteful number, since it uses less digits than its factorization.

2847221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219030.

The product of its digits is 1792, while the sum is 26.

The square root of 2847221 is about 1687.3710321088. The cubic root of 2847221 is about 141.7338962718.

The spelling of 2847221 in words is "two million, eight hundred forty-seven thousand, two hundred twenty-one".