2522221 has 4 divisors (see below), whose sum is σ = 2716252. Its totient is φ = 2328192.

The previous prime is 2522213. The next prime is 2522227. The reversal of 2522221 is 1222252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 972196 = 1245^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2522221 - 2³ = 2522213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2522195 and 2522204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2522227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96996 + ... + 97021.

It is an arithmetic number, because the mean of its divisors is an integer number (679063).

2^2522221 is an apocalyptic number.

It is an amenable number.

2522221 is a deficient number, since it is larger than the sum of its proper divisors (194031).

2522221 is a wasteful number, since it uses less digits than its factorization.

2522221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194030.

The product of its digits is 160, while the sum is 16.

The square root of 2522221 is about 1588.1501818153. The cubic root of 2522221 is about 136.1218091210.

Adding to 2522221 its reverse (1222252), we get a palindrome (3744473).

The spelling of 2522221 in words is "two million, five hundred twenty-two thousand, two hundred twenty-one".