2509221 has 16 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 1403520.

The previous prime is 2509219. The next prime is 2509237. The reversal of 2509221 is 1229052.

It is not a de Polignac number, because 2509221 - 2¹ = 2509219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496 + ... + 3353.

It is an arithmetic number, because the mean of its divisors is an integer number (245700).

2^2509221 is an apocalyptic number.

It is an amenable number.

2509221 is a deficient number, since it is larger than the sum of its proper divisors (1421979).

2509221 is a wasteful number, since it uses less digits than its factorization.

2509221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2509221 is about 1584.0520824771. The cubic root of 2509221 is about 135.8875403940.

The spelling of 2509221 in words is "two million, five hundred nine thousand, two hundred twenty-one".