2523221 has 4 divisors (see below), whose sum is σ = 2528172. Its totient is φ = 2518272.

The previous prime is 2523217. The next prime is 2523223. The reversal of 2523221 is 1223252.

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 2146225 + 376996 = 1465^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2523221 - 2² = 2523217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2523221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523223) 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, 1610 + ... + 2763.

It is an arithmetic number, because the mean of its divisors is an integer number (632043).

2^2523221 is an apocalyptic number.

It is an amenable number.

2523221 is a deficient number, since it is larger than the sum of its proper divisors (4951).

2523221 is an equidigital number, since it uses as much as digits as its factorization.

2523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950.

The product of its digits is 240, while the sum is 17.

The square root of 2523221 is about 1588.4649823021. The cubic root of 2523221 is about 136.1397964192.

Adding to 2523221 its reverse (1223252), we get a palindrome (3746473).

It can be divided in two parts, 2523 and 221, that added together give a cube (2744 = 14³).

The spelling of 2523221 in words is "two million, five hundred twenty-three thousand, two hundred twenty-one".