2257221 has 8 divisors (see below), whose sum is σ = 3031840. Its totient is φ = 1493712.

The previous prime is 2257207. The next prime is 2257237. The reversal of 2257221 is 1227522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2257221 - 2¹⁰ = 2256197 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 2¹⁴ + 5⁷ + 7 + 2¹⁶ + 2²¹ + 1 .

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 (2257291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2290 + ... + 3123.

It is an arithmetic number, because the mean of its divisors is an integer number (378980).

2^2257221 is an apocalyptic number.

It is an amenable number.

2257221 is a deficient number, since it is larger than the sum of its proper divisors (774619).

2257221 is a wasteful number, since it uses less digits than its factorization.

2257221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555.

The product of its digits is 560, while the sum is 21.

The square root of 2257221 is about 1502.4050718764. The cubic root of 2257221 is about 131.1771005605.

The spelling of 2257221 in words is "two million, two hundred fifty-seven thousand, two hundred twenty-one".