2815221 has 8 divisors (see below), whose sum is σ = 3806784. Its totient is φ = 1850240.

The previous prime is 2815207. The next prime is 2815237. The reversal of 2815221 is 1225182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2815221 - 2⁶ = 2815157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2815271) 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, 6396 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (475848).

2^2815221 is an apocalyptic number.

It is an amenable number.

2815221 is a deficient number, since it is larger than the sum of its proper divisors (991563).

2815221 is a wasteful number, since it uses less digits than its factorization.

2815221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13291.

The product of its digits is 320, while the sum is 21.

The square root of 2815221 is about 1677.8620324687. The cubic root of 2815221 is about 141.2009107095.

The spelling of 2815221 in words is "two million, eight hundred fifteen thousand, two hundred twenty-one".